What is ASP?
ASP stands for Active Server Pages. It is a server side technology which is used to display dynamic content on web pages. For example you could write code that would give your visitors different information, different images or even a totally different page depending on what browser version they are using.
ASP stands for Active Server Pages. It is a server side technology which is used to display dynamic content on web pages. For example you could write code that would give your visitors different information, different images or even a totally different page depending on what browser version they are using.
How can you disable the browser to view the code?
Writing codes within the Tag
Writing codes within the Tag
What is a "Virtual Directory"?
Virtual directories are aliases for directory paths on the server. It allows moving files on the disk between different folders, drives or even servers without changing the structure of web pages. It avoids typing an extremely long URL each time to access an ASP page.
Virtual directories are aliases for directory paths on the server. It allows moving files on the disk between different folders, drives or even servers without changing the structure of web pages. It avoids typing an extremely long URL each time to access an ASP page.
Which is the default Scripting Language of ASP (server-side)?
VBScript
Which is the default Data types in VBScript?
Variant is the default data type in VBScript, which can store a value of any type.
Variant is the default data type in VBScript, which can store a value of any type.
What is a variable?
Variable is a memory location through which the actual values are stored/retrieved. Its value can be changed.
Variable is a memory location through which the actual values are stored/retrieved. Its value can be changed.
What is the maximum size of an array?
Up to 60 dimensions.
Up to 60 dimensions.
What is Query string collection?
This collection stores any values that are provided in the URL. This can be generated by three methods:
By clicking on an anchor tag
By sending a form to the server by the GET method
Through user-typed HTTP address
It allows you to extract data sent to the server using a GET request.
This collection stores any values that are provided in the URL. This can be generated by three methods:
By clicking on an anchor tag
By sending a form to the server by the GET method
Through user-typed HTTP address
It allows you to extract data sent to the server using a GET request.
What are the attributes of the tags? What are their functions?
The two attributes are ACTION and METHOD
The ACTION gives the name of the ASP file that should be opened next by which this file can access the information given in the form The METHOD determines which of the two ways (POST or GET) the browser can send the information to the server
The two attributes are ACTION and METHOD
The ACTION gives the name of the ASP file that should be opened next by which this file can access the information given in the form The METHOD determines which of the two ways (POST or GET) the browser can send the information to the server
What are the methods in Session Object?
The Session Object has only one method, which is Abandon. It destroys all the objects stored in a Session Object and releases the server resources they occupied.
The Session Object has only one method, which is Abandon. It destroys all the objects stored in a Session Object and releases the server resources they occupied.
What is ServerVariables collection?
The ServerVariables collection holds the entire HTTP headers and also additional items of information about the server.
The ServerVariables collection holds the entire HTTP headers and also additional items of information about the server.
What is the difference between Querystring collection and Form collection?
The main difference is that the Querystring collection gets appended to a URL.
The main difference is that the Querystring collection gets appended to a URL.
What is a Form collection?
The Form collection holds the values of the form elements submitted with the POST method. This is the only way to generate a Form collection.
The Form collection holds the values of the form elements submitted with the POST method. This is the only way to generate a Form collection.
What are the ASP Scripting Objects?
The Dictionary object, the FileSystemObject object, TextStream object.
The Dictionary object, the FileSystemObject object, TextStream object.
What happens to a HTML page?
The browser makes a HTTP request; the server gives a HTTP response to the browser and the browser converts into a HTML page.
The browser makes a HTTP request; the server gives a HTTP response to the browser and the browser converts into a HTML page.
What happens to ASP pages?
The browser makes a HTTP request; the server does the processing and gives a HTML response to the browser.
The browser makes a HTTP request; the server does the processing and gives a HTML response to the browser.
How can you change the primary scripting language for a page?
Specify
Specify
What is application Object?
Shares information among users of an application. Gives a notification when an application starts or ends.
Shares information among users of an application. Gives a notification when an application starts or ends.
What is the difference between client-side script and server-side script?
Scripts executed only by the browser without contacting the server is called client-side script. It is browser dependent. The scripting code is visible to the user and hence not secure. Scripts executed by the web server and processed by the server is called server-side script.
Scripts executed only by the browser without contacting the server is called client-side script. It is browser dependent. The scripting code is visible to the user and hence not secure. Scripts executed by the web server and processed by the server is called server-side script.
What is the command to display characters to the HTML page?
Response.Write
Response.Write
Explain the POST & GET Method or Explain the difference between them?
POST METHOD:
The POST method generates a FORM collection, which is sent as a HTTP request body. All the values typed in the form will be stored in the FORM collection.
GET METHOD:
The GET method sends information by appending it to the URL (with a question mark) and stored as A Querystring collection. The Querystring collection is passed to the server as name/value pair.
The length of the URL should be less than 255 characters.
POST METHOD:
The POST method generates a FORM collection, which is sent as a HTTP request body. All the values typed in the form will be stored in the FORM collection.
GET METHOD:
The GET method sends information by appending it to the URL (with a question mark) and stored as A Querystring collection. The Querystring collection is passed to the server as name/value pair.
The length of the URL should be less than 255 characters.
How many global.asa files can an Application have?
Only one global.asa file and it’s placed in the virtual directory’s root.
How many global.asa files can an Application have?
Only one global.asa file and it’s placed in the virtual directory’s root.
Only one global.asa file and it’s placed in the virtual directory’s root.
What are Scripting Objects?
Objects that can enhance the application are known as the Scripting Objects.
Objects that can enhance the application are known as the Scripting Objects.
What is the Order of precedence for LOGICAL Operators ?
NOT, AND, OR, XOR, EQV, IMP
NOT, AND, OR, XOR, EQV, IMP
What is an Err Object?
Name it’s properties and methods.
Name it’s properties and methods.
What are LOCAL and GLOBAL variables?
Local variables lifetime ends when the Procedure ends. Global variables lifetime begins at the start of the script and ends at the end of the script and it can be used by any procedure within the script. Declaring a variable by using the keyword PRIVATE makes the variable global within the script, but if declared using PUBLIC, then all scripts can refer the variable.
Local variables lifetime ends when the Procedure ends. Global variables lifetime begins at the start of the script and ends at the end of the script and it can be used by any procedure within the script. Declaring a variable by using the keyword PRIVATE makes the variable global within the script, but if declared using PUBLIC, then all scripts can refer the variable.
Which is the default Scripting Language on the client side?
JavaScript
JavaScript
What is HTML (Hypertext Markup Language)?
It’s a method by which web pages can be built and generally used for formatting and linking text.
It’s a method by which web pages can be built and generally used for formatting and linking text.
What is a Web Server?
It’s a Computer that provides Web services on the Internet or on a local Intranet. It is designed to locate, address and send out simple HTML pages to all other users who access these pages.
It’s a Computer that provides Web services on the Internet or on a local Intranet. It is designed to locate, address and send out simple HTML pages to all other users who access these pages.
What is Session Object?
It stores information about a User’s session. Gives a notification when a user session begins or ends.
It stores information about a User’s session. Gives a notification when a user session begins or ends.
What is Server-Side includes?
It provides extra information by which it makes the site easier to manage. It can include text files using the #include statement, retrieve the size and last modification date of a file, defines how variables and error messages are displayed and inserts the values of HTTP variables in the page sent back to the browser.
It provides extra information by which it makes the site easier to manage. It can include text files using the #include statement, retrieve the size and last modification date of a file, defines how variables and error messages are displayed and inserts the values of HTTP variables in the page sent back to the browser.
What is a FileSystemObject object?
It provides access to the physical file system of the web server. It gets and manipulates information about all drives in a server, folders and sub-folders on a drive and files inside a folder.
It provides access to the physical file system of the web server. It gets and manipulates information about all drives in a server, folders and sub-folders on a drive and files inside a folder.
What is a Scripting Language?
It permits to create more interactive Web Pages. Validation, formatting of web pages can be done. VBScript, JavaScript are some examples.
It permits to create more interactive Web Pages. Validation, formatting of web pages can be done. VBScript, JavaScript are some examples.
What is a Dictionary object?
It lets you store and retrieve information in a flexible data structure. Each value or information stored in a Dictionary is associated with a key through which the information can be retrieved.
It lets you store and retrieve information in a flexible data structure. Each value or information stored in a Dictionary is associated with a key through which the information can be retrieved.
What is Global.asa file?
It is text file that contains details about an ASP application, such as when it should begin and end.
It is text file that contains details about an ASP application, such as when it should begin and end.
What is an .ASP file?
It is a Text File that contains the combination of the following:
Text
HTML tags
Script Commands
It is a Text File that contains the combination of the following:
Text
HTML tags
Script Commands
What is Response Object?
It controls the information sent to the user. The various methods are:
Response.Write - Sends information directly to a browser
Response.Redirect - Directs a user to a URL other than the requested URL
Response.ContentType - Controls the type of content sent
Response.Cookies - Sets cookie values
Response.Buffer - To Buffer information
It controls the information sent to the user. The various methods are:
Response.Write - Sends information directly to a browser
Response.Redirect - Directs a user to a URL other than the requested URL
Response.ContentType - Controls the type of content sent
Response.Cookies - Sets cookie values
Response.Buffer - To Buffer information
Naming constraints for a variable ?
It can be up to 255 characters Must start with an alphabet Must not contain an embedded period or full-stop
It can be up to 255 characters Must start with an alphabet Must not contain an embedded period or full-stop
What is a TextStream object?
It allows you to access(read/write) the contents of text files stored on the web server.
It allows you to access(read/write) the contents of text files stored on the web server.
What is IIS?
IIS is a Web Server that provides Web services, not only for web pages but also for ftp sites and video and audio services. It integrates with the database facilities of SQL Server.
IIS is a Web Server that provides Web services, not only for web pages but also for ftp sites and video and audio services. It integrates with the database facilities of SQL Server.
What is Request Object?
Gets information from the user. It has five collections by which values can be accessed. They are: Query string, Form, Cookies, Server Variables & Client Certificate
Gets information from the user. It has five collections by which values can be accessed. They are: Query string, Form, Cookies, Server Variables & Client Certificate
What are the special sub-types in VBScript?
EMPTY: has no value
NULL: Value does not exist (conjunction with database)
OBJECT:
EMPTY: has no value
NULL: Value does not exist (conjunction with database)
OBJECT:
What is Cookies collection?
Cookies are text files that store information about the user by which the web server identifies and marks each different visitor to a web site and determines where a user has been before. A cookie can store information only when the user sends it. Individual cookies are limited to 4KB of data. The maximum number of cookies allowed is 300.
Cookies are stored on client’s machine.
Cookies are text files that store information about the user by which the web server identifies and marks each different visitor to a web site and determines where a user has been before. A cookie can store information only when the user sends it. Individual cookies are limited to 4KB of data. The maximum number of cookies allowed is 300.
Cookies are stored on client’s machine.
What is the difference between Cookies collection and Form/Query string collection?
Cookie collection does not have the Count property. Cookies can have multiple values for the same cookie name but each value can be referred using a key whereas in a Form/Query string cookie each value has to be referred using an index value.
Cookie collection does not have the Count property. Cookies can have multiple values for the same cookie name but each value can be referred using a key whereas in a Form/Query string cookie each value has to be referred using an index value.
What is Server Object?
Controls the ASP execution environment. It can set the amount of time script can run before an error occurs. Converts a virtual path to a physical path on the server. Takes a user supplied string and encode it into proper format for a URL string.
Controls the ASP execution environment. It can set the amount of time script can run before an error occurs. Converts a virtual path to a physical path on the server. Takes a user supplied string and encode it into proper format for a URL string.
What is Collection?
Collection is a set of name/value pairs where the information supplied by the client is stored.
Collection is a set of name/value pairs where the information supplied by the client is stored.
How will you delete a Cookie?
By setting its Expires property to any date prior to today Response.Cookies("cookie name"). Expires = Date 1.
By setting its Expires property to any date prior to today Response.Cookies("cookie name"). Expires = Date 1.
What is the function of Buffer in Response Object?
Buffer controls the HTML output stream manually.
Buffer controls the HTML output stream manually.
How are scripts executed?
ASP provides scripting engines that execute the corresponding scripting languages on the server side. Scripts should be encoded within the Delimiters.
ASP provides scripting engines that execute the corresponding scripting languages on the server side. Scripts should be encoded within the Delimiters.
What is ASP (Active Server Pages)?
ASP is a server side-scripting environment for building dynamic and interactive web pages. Since the scripts run on the server side, the web server does all the processing.
ASP is a server side-scripting environment for building dynamic and interactive web pages. Since the scripts run on the server side, the web server does all the processing.
What are ARRAYS?
Arrays are variables that store items of similar information.DIM ARRAY1(4) (declares an array with the name array1 with 5 elements)
Arrays are variables that store items of similar information.DIM ARRAY1(4) (declares an array with the name array1 with 5 elements)
What is Application-scope?
Application-scope means that variables (and objects) can be accessed from any ASP pages that is part of the application.
Application-scope means that variables (and objects) can be accessed from any ASP pages that is part of the application.
What is Extranet?
An area of a web site available only to a set of registered visitors.
An area of a web site available only to a set of registered visitors.
In the sample code shown above, what will be written to the screen?
A. 1
B. 2
C. 1, 2
D. 1&2
E. Nothing. (Answer)
A. 1
B. 2
C. 1, 2
D. 1&2
E. Nothing. (Answer)
What are the types of HTML?
Static HTML Browser uses HTTP to request HTML file from the Web Server
Dynamic HTML Browser uses HTTP to request an executable application rather than a Static HTML file
Static HTML Browser uses HTTP to request HTML file from the Web Server
Dynamic HTML Browser uses HTTP to request an executable application rather than a Static HTML file
What are the properties of Session Object?
SessionID returns the session identification number for each user.
Timeout sets the timeout period assigned to the Session object for any application, in minutes.
CodePage determines the code page that will be used to display content.
LCID a locale identifier, which determines time zone and language, rules for the system
SessionID returns the session identification number for each user.
Timeout sets the timeout period assigned to the Session object for any application, in minutes.
CodePage determines the code page that will be used to display content.
LCID a locale identifier, which determines time zone and language, rules for the system
What are the event handlers of Session Object?
Session _OnStart This event will be fired when a new user begins a session with the web site.
Session_OnEnd This event is called whenever a session terminates.
Session _OnStart This event will be fired when a new user begins a session with the web site.
Session_OnEnd This event is called whenever a session terminates.
Name the ASP Objects?
Request Object
Response Object
Server Object
Session Object
Application Object
Request Object
Response Object
Server Object
Session Object
Application Object
What are the advantages of using ASP?
Minimizes network traffic by limiting the need for the browser and server to talk to each other Makes for quicker loading time since HTML pages are only downloaded
Allows to run programs in languages that are not supported by the browser
Can provide the client with data that does not reside on the client’s machine
Provides improved security measures since the script cannot be viewed by the browser
Minimizes network traffic by limiting the need for the browser and server to talk to each other Makes for quicker loading time since HTML pages are only downloaded
Allows to run programs in languages that are not supported by the browser
Can provide the client with data that does not reside on the client’s machine
Provides improved security measures since the script cannot be viewed by the browser
What are the methods in Application Object?
Lock prevents clients from modifying the variables stored in the Application object.
Unlock removes the lock from variables stored in the Application object.
Lock prevents clients from modifying the variables stored in the Application object.
Unlock removes the lock from variables stored in the Application object.
What are the methods in Application Object?
Internet Information Server (IIS) on Windows NT
Personal Web Server (PWS) on Windows 95
Peer Web Services on Windows NT
Internet Information Server (IIS) on Windows NT
Personal Web Server (PWS) on Windows 95
Peer Web Services on Windows NT
What are the browsers that can access ASP pages?
Internet Explorer (supports VBScript, JavaScript)
Netscape Communicator/ Navigator (supports only JavaScript, VBScript can be also added too)
Internet Explorer (supports VBScript, JavaScript)
Netscape Communicator/ Navigator (supports only JavaScript, VBScript can be also added too)
How does the server identify and execute the server-side scripts within HTML code?
Including the RUNAT=SERVER attribute
Including the RUNAT=SERVER attribute
What are the methods by which output stream is controlled?
Flush sends previous buffered output to the client immediately, but continues processing the script.
Clear erases any already-buffered HTML.
End causes the server to stop processing the script.
Flush sends previous buffered output to the client immediately, but continues processing the script.
Clear erases any already-buffered HTML.
End causes the server to stop processing the script.
What are the properties used to control the expiration of the page?
Expires specifies the number of minutes before a page cached on a browser expires.
Expires Absolute sets the date and time at which a page cached on a browser expires.
Expires specifies the number of minutes before a page cached on a browser expires.
Expires Absolute sets the date and time at which a page cached on a browser expires.
What are the collections of Session Object?
Contents collection contains all the variables established for a session without using the tag.
Static collection contains all the objects created
Contents collection contains all the variables established for a session without using the tag.
Static collection contains all the objects created
What is the difference between ASP and HTML? Or Why ASP is better than HTML?
- ASP executes code on the server side whereas the browser interprets HTML.
- ASP can use any scripting languages
- Gets feedback from the user and return information to the user
- Create pages that will be customized to display only things that will be of interest to a particular user
- Can edit contents of a web page by updating a text file or a database rather than the HTML code itself
- ASP executes code on the server side whereas the browser interprets HTML.
- ASP can use any scripting languages
- Gets feedback from the user and return information to the user
- Create pages that will be customized to display only things that will be of interest to a particular user
- Can edit contents of a web page by updating a text file or a database rather than the HTML code itself
What are the event handlers of Application Object?
Application_OnStart- This event will be fired when the first visitor hits the page.
Application_OnEnd- This event runs when the server is stopped.
Application_OnStart- This event will be fired when the first visitor hits the page.
Application_OnEnd- This event runs when the server is stopped.
Name some of the ASP components?
Ad Rotator component- a way to manage advertisements on the web site.
Content Linker component - a technique to direct users through a set of pages on a web site by creating a list of URLs and description of the next and previous pages.
Browser Capabilities component - allows to customize the page to the ability of the browser viewing it.
Database Access component - allows to access data from the database
Ad Rotator component- a way to manage advertisements on the web site.
Content Linker component - a technique to direct users through a set of pages on a web site by creating a list of URLs and description of the next and previous pages.
Browser Capabilities component - allows to customize the page to the ability of the browser viewing it.
Database Access component - allows to access data from the database
What are the tasks performed by < FORM > tags?
tags provides space for the user to input values
the form has a button to submit information back to the server
It transfers control to another ASP page
It carries the information in the fields to another ASP page
tags provides space for the user to input values
the form has a button to submit information back to the server
It transfers control to another ASP page
It carries the information in the fields to another ASP page
What are the tags necessary to be present within the
-----tag: Provides input spaces (text boxes, combo boxes, radio button, etc.) on a form called fields. It has three attributes TYPE, NAME and VALUE. TYPE provides the characteristics of the field and the NAME specifies a name to the field by which it can be referred.
-----tag: Provides input spaces (text boxes, combo boxes, radio button, etc.) on a form called fields. It has three attributes TYPE, NAME and VALUE. TYPE provides the characteristics of the field and the NAME specifies a name to the field by which it can be referred.
What are the collections of Application Object?
Contents collection - contains all variables added via scripts in global.asa.
Static collection - contains the names of all objects.
Contents collection - contains all variables added via scripts in global.asa.
Static collection - contains the names of all objects.
What is smart navigation?
The cursor position is maintained when the page gets refreshed due to the server side validation and the page gets refreshed.
The cursor position is maintained when the page gets refreshed due to the server side validation and the page gets refreshed.
What is view state?
The web is stateless. But in ASP.NET, the state of a page is maintained in the in the page itself automatically. How? The values are encrypted and saved in hidden controls. this is done automatically by the ASP.NET. This can be switched off / on for a single control
The web is stateless. But in ASP.NET, the state of a page is maintained in the in the page itself automatically. How? The values are encrypted and saved in hidden controls. this is done automatically by the ASP.NET. This can be switched off / on for a single control
How do you validate the controls in an ASP .NET page?
Using special validation controls that are meant for this. We have Range Validator, Email Validator.
Using special validation controls that are meant for this. We have Range Validator, Email Validator.
Can the validation be done in the server side? Or this can be done only in the Client side?
Client side is done by default. Server side validation is also possible. We can switch off the client side and server side can be done.
Client side is done by default. Server side validation is also possible. We can switch off the client side and server side can be done.
How to manage pagination in a page?
Using pagination option in DataGrid control. We have to set the number of records for a page, then it takes care of pagination by itself.
Using pagination option in DataGrid control. We have to set the number of records for a page, then it takes care of pagination by itself.
What is ADO .NET and what is difference between ADO and ADO.NET?
ADO.NET is stateless mechanism. I can treat the ADO.Net as a separate in-memory database where in I can use relationships between the tables and select insert and updates to the database. I can update the actual database as a batch.
ADO.NET is stateless mechanism. I can treat the ADO.Net as a separate in-memory database where in I can use relationships between the tables and select insert and updates to the database. I can update the actual database as a batch.
Explain the differences between Server-side and Client-side code?
Server side scripting means that all the script will be executed by the server and interpreted as needed. ASP doesn’t have some of the functionality like sockets, uploading, etc. For these you have to make a custom components usually in VB or VC++. Client side scripting means that the script will be executed immediately in the browser such as form field validation, clock, email validation, etc. Client side scripting is usually done in VBScript or JavaScript. Download time, browser compatibility, and visible code - since JavaScript and VBScript code is included in the HTML page, then anyone can see the code by viewing the page source. Also a possible security hazards for the client computer.
What type of code (server or client) is found in a Code-Behind class?
C#
C#
Should validation (did the user enter a real date) occur server-side or client-side? Why?
Client-side validation because there is no need to request a server side date when you could obtain a date from the client machine.
Client-side validation because there is no need to request a server side date when you could obtain a date from the client machine.
What does the "EnableViewState" property do? Why would I want it on or off?
Enable ViewState turns on the automatic state management feature that enables server controls to re-populate their values on a round trip without requiring you to write any code. This feature is not free however, since the state of a control is passed to and from the server in a hidden form field. You should be aware of when ViewState is helping you and when it is not. For example, if you are binding a control to data on every round trip (as in the datagrid example in tip #4), then you do not need the control to maintain it’s view state, since you will wipe out any re-populated data in any case. ViewState is enabled for all server controls by default. To disable it, set the EnableViewState property of the control to false.
Enable ViewState turns on the automatic state management feature that enables server controls to re-populate their values on a round trip without requiring you to write any code. This feature is not free however, since the state of a control is passed to and from the server in a hidden form field. You should be aware of when ViewState is helping you and when it is not. For example, if you are binding a control to data on every round trip (as in the datagrid example in tip #4), then you do not need the control to maintain it’s view state, since you will wipe out any re-populated data in any case. ViewState is enabled for all server controls by default. To disable it, set the EnableViewState property of the control to false.
What is the difference between Server.Transfer and Response.Redirect?
Why would I choose one over the other? Server.Transfer() : client is shown as it is on the requesting page only, but the all the content is of the requested page. Data can be persist across the pages using Context.Item collection, which is one of the best way to transfer data from one page to another keeping the page state alive. Response.Dedirect() :client know the physical location (page name and query string as well). Context.Items loses the persistence when navigate to destination page. In earlier versions of IIS, if we wanted to send a user to a new Web page, the only option we had was Response.Redirect. While this method does accomplish our goal, it has several important drawbacks. The biggest problem is that this method causes each page to be treated as a separate transaction. Besides making it difficult to maintain your transactional integrity, Response.Redirect introduces some additional headaches. First, it prevents good encapsulation of code. Second, you lose access to all of the properties in the Request object. Sure, there are workarounds, but they’re difficult. Finally, Response.Redirect necessitates a round trip to the client, which, on high-volume sites, causes scalability problems. As you might suspect, Server.Transfer fixes all of these problems. It does this by performing the transfer on the server without requiring a roundtrip to the client.
Why would I choose one over the other? Server.Transfer() : client is shown as it is on the requesting page only, but the all the content is of the requested page. Data can be persist across the pages using Context.Item collection, which is one of the best way to transfer data from one page to another keeping the page state alive. Response.Dedirect() :client know the physical location (page name and query string as well). Context.Items loses the persistence when navigate to destination page. In earlier versions of IIS, if we wanted to send a user to a new Web page, the only option we had was Response.Redirect. While this method does accomplish our goal, it has several important drawbacks. The biggest problem is that this method causes each page to be treated as a separate transaction. Besides making it difficult to maintain your transactional integrity, Response.Redirect introduces some additional headaches. First, it prevents good encapsulation of code. Second, you lose access to all of the properties in the Request object. Sure, there are workarounds, but they’re difficult. Finally, Response.Redirect necessitates a round trip to the client, which, on high-volume sites, causes scalability problems. As you might suspect, Server.Transfer fixes all of these problems. It does this by performing the transfer on the server without requiring a roundtrip to the client.
Can you give an example of when it would be appropriate to use a web service as opposed to a non-serviced .NET component?
When to Use Web Services:
* Communicating through a Firewall When building a distributed application with 100s/1000s of users spread over multiple locations, there is always the problem of communicating between client and server because of firewalls and proxy servers. Exposing your middle tier components as Web Services and invoking the directly from a Windows UI is a very valid option.
* Application Integration When integrating applications written in various languages and running on disparate systems. Or even applications running on the same platform that have been written by separate vendors.
* Business-to-Business Integration This is an enabler for B2B integration which allows one to expose vital business processes to authorized supplier and customers. An example would be exposing electronic ordering and invoicing, allowing customers to send you purchase orders and suppliers to send you invoices electronically.
* Software Reuse This takes place at multiple levels. Code Reuse at the Source code level or binary component-based reuse. The limiting factor here is that you can reuse the code but not the data behind it. Webservice overcome this limitation. A scenario could be when you are building an app that aggregates the functionality of several other Applications. Each of these functions could be performed by individual apps, but there is value in perhaps combining the multiple apps to present a unified view in a Portal or Intranet.
* When not to use Web Services: Single machine Applications When the apps are running on the same machine and need to communicate with each other use a native API. You also have the options of using component technologies such as COM or .NET Components as there is very little overhead.
* Homogeneous Applications on a LAN If you have Win32 or Winforms apps that want to communicate to their server counterpart. It is much more efficient to use DCOM in the case of Win32 apps and .NET Remoting in the case of .NET Apps.
When to Use Web Services:
* Communicating through a Firewall When building a distributed application with 100s/1000s of users spread over multiple locations, there is always the problem of communicating between client and server because of firewalls and proxy servers. Exposing your middle tier components as Web Services and invoking the directly from a Windows UI is a very valid option.
* Application Integration When integrating applications written in various languages and running on disparate systems. Or even applications running on the same platform that have been written by separate vendors.
* Business-to-Business Integration This is an enabler for B2B integration which allows one to expose vital business processes to authorized supplier and customers. An example would be exposing electronic ordering and invoicing, allowing customers to send you purchase orders and suppliers to send you invoices electronically.
* Software Reuse This takes place at multiple levels. Code Reuse at the Source code level or binary component-based reuse. The limiting factor here is that you can reuse the code but not the data behind it. Webservice overcome this limitation. A scenario could be when you are building an app that aggregates the functionality of several other Applications. Each of these functions could be performed by individual apps, but there is value in perhaps combining the multiple apps to present a unified view in a Portal or Intranet.
* When not to use Web Services: Single machine Applications When the apps are running on the same machine and need to communicate with each other use a native API. You also have the options of using component technologies such as COM or .NET Components as there is very little overhead.
* Homogeneous Applications on a LAN If you have Win32 or Winforms apps that want to communicate to their server counterpart. It is much more efficient to use DCOM in the case of Win32 apps and .NET Remoting in the case of .NET Apps.
What method do you use to explicitly kill a user’s session?
The Abandon method destroys all the objects stored in a Session object and releases their resources.
If you do not call the Abandon method explicitly, the server destroys these objects when the session times out.
Syntax: Session.Abandon
The Abandon method destroys all the objects stored in a Session object and releases their resources.
If you do not call the Abandon method explicitly, the server destroys these objects when the session times out.
Syntax: Session.Abandon
Describe the difference between a Thread and a Process?
Thread - is used to execute more than one program at a time.
process - executes single program
Is string a value type or a reference type?
Answer:
String is Reference Type.
Value type - bool, byte, chat, decimal, double, enum , float, int, long, sbyte, short,strut, uint, ulong, ushort
Value types are stored in the Stack
Reference type - class, delegate, interface, object, string
Reference types are stored in the Heap
Thread - is used to execute more than one program at a time.
process - executes single program
Is string a value type or a reference type?
Answer:
String is Reference Type.
Value type - bool, byte, chat, decimal, double, enum , float, int, long, sbyte, short,strut, uint, ulong, ushort
Value types are stored in the Stack
Reference type - class, delegate, interface, object, string
Reference types are stored in the Heap
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