My operating system was crashed so i have again downloaded and installed Microsoft Visual Studio 2010 Express edition beat 2. But when i was trying to create a web application then i got the error message that “The operation could not be completed. Class not registered.” Other projects were working fine and I am able to create asp.net website. After doing searching for sometime the i found following link.
From that i found that it was Microsoft SQL Server Express edition that is creating problem. I had installed Microsoft Visual Studio IDE not the SQL Server Express 2008 edition. So i have installed SQL Server Express Edition 2008 and now its working fine. But it is very strange that i can not create a web application project with out installing it.