Definitely yes. Please refer to the "Walkthrough: Debugging an Add-In
Project" topic in MSDN.
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Dmitriy Lapshin [C# / .NET MVP]
X-Unity Test Studio http://www.x-unity.net/teststudio.aspx
Bring the power of unit testing to VS .NET IDE
Can I debug my addin written in C#?
If yes, how??