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Asp.Net Interview Questions
Asp.Net 2.0/3.5 Sample Interview Questions and Answers. Interview Tips for a successful job Interview


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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1. Asp.Net 2.0 General Questions

Asp.NET 2.0 Questions Home
   1.1 Do I need IIS to run Web applications?
   1.2 How do I create pages for mobile devices?
   1.3 Are ASP.NET pages XHTML compatible?
   1.4 Can I hide the source code for my page?
   1.5 When I run a page, I get the error "The page cannot be displayed" and an HTTP 502 Proxy Error. Why?
   1.6 Which page code model is preferable, single-file or code-behind?
   1.7 Is it better to write code in C# or Visual Basic?
   1.8 Do I have to use one programming language for all my Web pages?
   1.9 Is the code in single-file and code-behind pages identical?
   1.10 Is the old code-behind model still supported?

1.1 Do I need IIS to run Web applications?

If you are using Visual Studio, you can use the ASP.NET Development Server built into Visual Studio to test your pages. The server functions as a local Web server, running ASP.NET Web pages in a manner virtually identical to how they run in IIS. To deploy a Web application, you need to copy it to a computer running IIS version 5 or 6.

1.2 How do I create pages for mobile devices?

ASP.NET will automatically detect the type of browser making the request. This information is used by the page and by individual controls to render appropriate markup for that browser. You therefore do not need to use a special set of pages or controls for mobile devices. (Whether you can design a single page to work with all types of browsers will depend on the page, on the browsers you want to target, and on your own goals.)

1.3 Are ASP.NET pages XHTML compatible?

Yes. Individual controls render markup that is compatible with the XHTML 1.1 standard. It is up to you, however, to include the appropriate document type declaration and other XHTML document elements. ASP.NET does not insert elements for you to ensure XHTML compatibility. For details, see ASP.NET and XHTML Compliance.

1.4 Can I hide the source code for my page?

Server-side code is processed on the server and is not sent to the browser, so users cannot see it. However, client script is not protected; any client script that you add to your page, or that is injected into the page by server processing, is visible to users. If you are concerned about protecting your source code on the server, you can precompile your site and deploy the compiled version. For details, see Publishing Web Sites.

1.5 When I run a page, I get the error "The page cannot be displayed" and an HTTP 502 Proxy Error. Why?

This error can occur if you are running ASP.NET Web pages using the Visual Web Developer Web server, because the URL includes a randomly selected port number. Proxy servers do not recognize the URL and return this error. To get around the problem, change your settings in Internet Explorer to bypass the proxy server for local addresses, so that the request is not sent to the proxy. In Internet Explorer, you can make this change in Tools > Internet Options. In the Connections tab, click LAN Settings and then select Bypass proxy server for local addresses.

1.6 Which page code model is preferable, single-file or code-behind?

Both models function the same and have the same performance. The choice of using single-file pages versus code-behind pages is one of personal preference and convenience. For details, see ASP.NET Web Page Code Model.

The QuickStart examples and examples in the API reference seem to use single-file pages frequently. Does this mean that single-file is the preferred model for pages?

No. Single-file pages are frequently used in examples because they are easier to illustrate — the writer does not have to create a separate file to show the code.

1.7 Is it better to write code in C# or Visual Basic?

You can write code for your Web application in any language supported by the .NET Framework. That includes Visual Basic, C#, J#, JScript, and others. Although the languages have different syntax, they all compile to the same object code. The languages have small differences in how they support different features. For example, C# provides access to unmanaged code, while Visual Basic supports implicit event binding via the Handles clause. However, the differences are minor, and unless your requirements involve one of these small differences, the choice of programming language is one of personal preference. Once programs are compiled, they all perform identically; that is, Visual Basic programs run just as fast as C# programs, since they both produce the same object code.

1.8 Do I have to use one programming language for all my Web pages?

No. Each page can be written in a different programming language if you want, even in the same application. If you are creating source code files and putting them in the \App_Code folder to be compiled at run time, all the code in must be in the same language. However, you can create subfolders in the \App_Code folder and use the subfolders to store components written in different programming languages.

1.9 Is the code in single-file and code-behind pages identical?

Almost. A code-behind file contains an explicit class declaration, which is not required for single-file pages.

1.10 Is the old code-behind model still supported?

Old projects will continue to run without change. In Visual Studio 2005, if you open a project created in Visual Studio .NET 2002 or 2003, by default, the project is converted to the new project layout used in Visual Studio 2005. As part of the conversion, pages that use the old code-behind model are converted to use the new code-behind model. Visual Studio 2005 Web Application Projects provide an alternative web project model that uses the same project, build and compilation semantics as the Visual Studio .NET 2003 code-behind model. For details, see Visual Studio 2005 Web Application Projects.

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