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Asp.Net FAQs

Asp.NET 2.0 Qs

Knowledgebase

Interview Questions Asp.net [1]
Interview Questions Asp.net[2]
Interview Questions Asp.net[3]
Interview Questions Asp.Net 2.0[New]
Creating Virtual Directories in IIS using .NET
ASP.NET Web Server Performance Tuning: A Few Real-World Techniques
.NET Development[Forum]
Asp.Net Discussion[Forum]
Code Samples

Articles

Tools

 

Resources

Finding Correct Content Managemet System
This list covers the full lifecycle of a content management system, from initially creating the content, through to delivering it to end users...

Workflow Managemet Systems
Workflow management is a crucial component in organizing a variety of business processes so that they benefit the business as a whole and increase profitability...

Using the Power of Content Management Systems
With page editors that resemble a word processor program, adding content with a CMS interface is simple and fun. Most CMS software also allows you to change the location of your content pages and links easily, while the back end processes takes care of updating the links throughout your site...

Content Management Systems (CMS): What They Are And Why We Love Them
In the past, individuals who took interest in having and operating their own websites were burdened with the task of learning HTML, DHTML, and other web-based technologies such as JavaScript and CSS. The only alternative to this was, unfortunately, to pocket the expenses and costs required to pay a web developer to build and maintain it for them...

Outsourcing
Post your project for outsourcing and get bids from qualified programmers, designers, interpreters, copywriters.


 

Code Walkthroughs

Datagrid Formatting the Data
We are able to format the content of the datagrid cell by one of two simple methods, dependant upon whether the column is a bound column or whether it is a template column. In our example we shall format the column to have to digits after the decimal point , followed by a...

Datagrid Highlight a Row With Click Through
It is relatively easy to add alternating colours to the rows in your datagrid. However, when we move the mouse over the rows we may want to highlight this row, and possibly to add the option of a click through based on the row selected...

Add a Delete Button to a Datagrid
To add a delete button to a datagrid follows a similar process to adding an edit button. In the datagrid header...

Add an Edit Button to a Datagrid
The datagrid has a predefined editColumn for handling the editing of a datagrid. Adding this simple column definition to a datagrid adds a powerful feature. When a row is not in edit mode the column item shows the word...

Making a Datagrid Row Editable
Two of the most popular methods of editing a datagrid in asp.net are to either select the row and take the user off to a different presentation of the data, or to change the formatting of the row presented in the database with appropriate edit text boxes, checkboxes and...

Adding Tooltips to Datagrid Rows
Adding tooltips to datagrid rows is easy, assuming that you have already created the code for adding row highlighting. In this article I shall assume that you have already read the article entitled Datagrid Highlight a Row With Click Through...

Binding a Datagrid to an Access Database
This list covers the full lifecycle of a content management system, from initially creating the content, through to delivering it to end users...

Adding Data to a DropDownList
The aim of this article is to answer the question 'How do I add items to a DropDownList?' Initially as part of the declaration for the DropDownList we can also define a number of items, much in the same way as in classic ASP...

Getting Current Date Time
In classic ASP we had now() which would return the current date and time. For asp.net this no longer exists. So what should we use...

Test if File Exists
Sometimes, in order to reduce our chance of error, when working with the filesystem in ASP.NET, we need to determine wether a file exists before performing an action on it. The following short piece of code will enable us to test whether a file exists...

Using Javascript with ASP.NET Form Elements
Adding simple pieces of Javascript to an Asp.net page can be acheived by adding to the attributes of the particular imagebutton or linkbutton. if its normal ASP.Net Button then you can...

Regular Expressions
In the table below we list the characters used in .Net regular expressions, together with their meaning, But first...

Authentication in Asp.net
Forms authentication in ASP.Net is far more easier and safe than Asp 3. It is possible to place a web.config file in any directory of a web site.Therefore, we are able to make most of a web site public, whilst providing authentication on, say, one directory...

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Asp.NET Job Interview Questions (Part 1)


  1. What do I need to create and run an ASP.NET application?
  • Windows 2000, Windows Server 2003 or Windows XP.
  • ASP.NET, which can be either the redistributable (included in the .NET SDK) or Visual Studio .NET.
  1. Where can I download the .NET SDK?

    .NET SDK can be obtained here.

    (You have to install the Microsoft .NET Framework Version 1.1 Redistributable Package before installing the .NET SDK.)

  2. Are there any free IDEs for the .NET SDK?
    • Microsoft provides Visual Studio 2005 Express Edition Beta for free. Of particular interest to the ASP.NET developers would be the Visual Web Developer 2005 Express Edition Beta 2 available as a free download.
    • The ASP.NET Web Matrix Project (supported by Microsoft) is a free IDE for developing ASP.NET applications and is available here.
    • There is also a free open-source UNIX version of the Microsoft .NET development platform called Mono available for download here.
    • Another increasingly popular Open Source Development Environment for .NET is the #develop (short for SharpDevelop) available for download here.
  3. When was ASP.NET released?

    ASP.NET is a part of the .NET framework which was released as a software platform in 2002.

  4. Is a new version coming up?

    ASP.NET 2.0, Visual Studio 2005 (Whidbey), Visual Web Developer 2005 Express Edition are the next releases of Microsoft's Web platform and tools. They have already been released as Beta versions. They are scheduled to be released in the week of November 7, 2005.

  5. Explain Namespace.

    Namespaces are logical groupings of names used within a program. There may be multiple namespaces in a single application code, grouped based on the identifiers’ use. The name of any given identifier must appear only once in its namespace.

  6. List the types of Authentication supported by ASP.NET.
    • Windows (default)
    • Forms
    • Passport
    • None (Security disabled)
  7. What is CLR?

    Common Language Runtime (CLR) is a run-time environment that manages the execution of .NET code and provides services like memory management, debugging, security, etc. The CLR is also known as Virtual Execution System (VES).

  8. What is CLI?

    The CLI is a set of specifications for a runtime environment, including a common type system, base class library, and a machine-independent intermediate code known as the Common Intermediate Language (CIL). (Source: Wikipedia.)

  9. List the various stages of Page-Load lifecycle.
    • Init()
    • Load()
    • PreRender()
    • Unload()
  10. Explain Assembly and Manifest.

    An assembly is a collection of one or more files and one of them (DLL or EXE) contains a special metadata called Assembly Manifest. The manifest is stored as binary data and contains details like versioning requirements for the assembly, the author, security permissions, and list of files forming the assembly. An assembly is created whenever a DLL is built. The manifest can be viewed programmatically by making use of classes from the System.Reflection namespace. The tool Intermediate Language Disassembler (ILDASM) can be used for this purpose. It can be launched from the command prompt or via Start> Run.

  11. What is Shadow Copy?

    In order to replace a COM component on a live web server, it was necessary to stop the entire website, copy the new files and then restart the website. This is not feasible for the web servers that need to be always running. .NET components are different. They can be overwritten at any time using a mechanism called Shadow Copy. It prevents the Portable Executable (PE) files like DLLs and EXEs from being locked. Whenever new versions of the PEs are released, they are automatically detected by the CLR and the changed components will be automatically loaded. They will be used to process all new requests not currently executing, while the older version still runs the currently executing requests. By bleeding out the older version, the update is completed.

  12. What is DLL Hell?

    DLL hell is the problem that occurs when an installation of a newer application might break or hinder other applications as newer DLLs are copied into the system and the older applications do not support or are not compatible with them. .NET overcomes this problem by supporting multiple versions of an assembly at any given time. This is also called side-by-side component versioning.

  13. Explain Web Services.

    Web services are programmable business logic components that provide access to functionality through the Internet. Standard protocols like HTTP can be used to access them. Web services are based on the Simple Object Access Protocol (SOAP), which is an application of XML. Web services are given the .asmx extension.

  14. Explain Windows Forms.

    Windows Forms is employed for developing Windows GUI applications. It is a class library that gives developers access to Windows Common Controls with rich functionality. It is a common GUI library for all the languages supported by the .NET Framework.

  15. What is Postback?

    When an action occurs (like button click), the page containing all the controls within the <FORM... > tag performs an HTTP POST, while having itself as the target URL. This is called Postback.

  16. 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. 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. Since the code is included in the HTML page, anyone can see the code by viewing the page source. It also poses as a possible security hazard for the client computer.

  17. Enumerate the types of Directives.
    • @ Page directive
    • @ Import directive
    • @ Implements directive
    • @ Register directive
    • @ Assembly directive
    • @ OutputCache directive
    • @ Reference directive
  18. What is Code-Behind?

    Code-Behind is a concept where the contents of a page are in one file and the server-side code is in another. This allows different people to work on the same page at the same time and also allows either part of the page to be easily redesigned, with no changes required in the other. An Inherits attribute is added to the @ Page directive to specify the location of the Code-Behind file to the ASP.NET page.

  19. Describe the difference between inline and code behind.

    Inline code is written along side the HTML in a page. There is no separate distinction between design code and logic code. Code-behind is code written in a separate file and referenced by the .aspx page.

  20. List the ASP.NET validation controls?
    • RequiredFieldValidator
    • RangeValidator
    • CompareValidator
    • RegularExpressionValidator
    • CustomValidator
    • ValidationSummary
  21. What is Data Binding?

    Data binding is a way used to connect values from a collection of data (e.g. DataSet) to the controls on a web form. The values from the dataset are automatically displayed in the controls without having to write separate code to display them.

  22. Describe Paging in ASP.NET.

    The DataGrid control in ASP.NET enables easy paging of the data. The AllowPaging property of the DataGrid can be set to True to perform paging. ASP.NET automatically performs paging and provides the hyperlinks to the other pages in different styles, based on the property that has been set for PagerStyle.Mode.

  23. Should user input data validation occur server-side or client-side? Why?

    All user input data validation should occur on the server and minimally on the client-side, though it is a good way to reduce server load and network traffic because we can ensure that only data of the appropriate type is submitted from the form. It is totally insecure. The user can view the code used for validation and create a workaround for it. Secondly, the URL of the page that handles the data is freely visible in the original form page. This will allow unscrupulous users to send data from their own forms to your application. Client-side validation can sometimes be performed where deemed appropriate and feasible to provide a richer, more responsive experience for the user.

  24. What is the difference between Server.Transfer and Response.Redirect?
    • Response.Redirect: This tells the browser that the requested page can be found at a new location. The browser then initiates another request to the new page loading its contents in the browser. This results in two requests by the browser.
    • Server.Transfer: It transfers execution from the first page to the second page on the server. As far as the browser client is concerned, it made one request and the initial page is the one responding with content. The benefit of this approach is one less round trip to the server from the client browser. Also, any posted form variables and query string parameters are available to the second page as well.
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