What are some important differences between classic ASP and ASP.Net?

The most important difference between ASP and ASP.Net is that ASP uses interpreted VBScript or JScript, and ASP.net uses any .Net language (including VB.Net, C#, J#, etc.) compiled.

Thanks a lot

state management support will not be there in classic asp.

http://www.codeproject.com/Articles/16703/Differences-between-ASP-NET-and-ASP