Wikipedia
CSharpBuilder
C#Builder, from Borland Software Corporation, is a computer program that allows programmers to create Microsoft Windows and Web applications for the Microsoft .NET Framework using the programming language C#.
A Rapid Application Development IDE, it is an alternative to Microsoft's Visual Studio .NET 2003. It provided a way into .NET programming for Borland-based shops. C#Builder's functionality has since been incorporated into Borland's Delphi and C#Builder is no longer developed as a separate application.
It is unable to use the Compact Framework due to a combination of technical and licensing issues.