naveedbaig:Can any body tell me, What are the benifits to convert the application asp.net 1.1 to 2.0.
Most of the benefits are the new controls and tools for faster development, and new features.
Things like all the login controls, provider models, master pages, the new data bound controls, table adapters etc
To develop new applications in .NET 1.x would be awful compared to .NET 2.0 so if you are contemplating on a new web application between 1.1 and 2.0, then go 2.0 without a doubt unless there are some requirements or constraints that prohibit .NET 2.0
If you are wanting to migrate to .NET 2.0 then i would look at it carefully. If you are in maintenance/support mode then I do not see a reason to upgrade to 2.0 as it may brnig you problems where you need to spend time to debug/convert code, especially if the web application is complex.
If you have a .NET 1.1 app that you want to extend features over time and can see potential with the new .NET 2.0 features, then go for it. Web development in .NET 2.0 is much easier then 1.1.
Here are a list of changes in 2.0
http://msdn2.microsoft.com/en-us/library/fa1h9d0d(VS.80).aspx
http://quickstarts.asp.net/QuickstartV20/aspnet/