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Early in 2002, Microsoft released its new platform for Internet development. Dubbed .NET, this platform included the long-awaited successor to ASP. Originally entitled ASP+, it was finally released as ASP.NET under the new naming scheme for Microsoft's Internet development products.
Compared to ASP, ASP.NET represented a leap forward both in complexity and productivity for the developer. It maintains its flexibility in the choice of language, but instead of a range of simple scripting languages, developers must choose between several full-fledged programming languages. Development in ASP.NET can require not only an understanding of HTML and Web design, but also a firm grasp on the concepts of object-oriented programming and development.
A good introduction to using ASP.Net can be found here
Full documentation is available here
Here's a simple web page you can use to test ASP.Net
Just create a text file with the following contents:
Save it as a .aspx file - eg test.aspx and upload it to your account. The view it with your web browser at http://www.domainname.com/test.aspx