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Re:C# Language Specification 5.0 by TheMakeA on Tuesday June 25, 2013 @03:05AM (#5937985)
The Visual Studio IDE and Expression Blend are (or at least were) WPF... I guess there's a pretty good chance it was C# rather than VB.NET.

Not sure if there is anything else though.

Re:C# Language Specification 5.0 by rbirkby on Tuesday June 25, 2013 @03:14AM (#5938015)
Visual Studio since 2002 (.Net 1.0) has been partly written in C#/WinForms and then C#/WPF. Visual Interdev (from which the current Visual Studio lineage descends) was partly written in VJ++. It was these bits that were ported to C#/COOL for the 2002 release.