In a response to feedback from developers, Microsoft has decided to extend the "Edit and Continue" feature, formerly available only with VB.NET and C++, to C# projects as well.
Edit and Continue is a debugger feature that allows you to pause an application being debugged, make changes to the code, and then continue without a full project recompile. This feature was originally part of VB6 and was sorely missed by VB.NET developers prior to Whidbey. When it was announced that VB.NET 2005 would include E&C, C# programmers wrote in to Microsoft's feedback page asking that it be made available in C# as well