messagebox in C#

There is no class like System.Windows.Form in C#....... as i want to use messagebox in C# I have added reference as In solution explorer -> right click to website add refenrence -> system.windows.forms check checkbox write in program i.e. default.aspx using system.windows.forms; //add lib use messagebox("Hello");

What is the .NET Framework?

What is the .NET Framework? The Microsoft .NET Framework is a platform for building, deploying, and running Web Services and applications. It provides a highly productive, standards-based, multi-language environment for integrating existing investments with next-generation applications and services as well as the agility to solve the challenges of deployment and operation of Internet-scale applications. The .NET Framework consists of three main parts: the common language runtime, a hierarchical set of unified class libraries, and a componentized version of Active Server Pages called ASP.NET.