C# Gap Coverage

Good Start for Modern Windows GUI Guidelines
https://msdn.microsoft.com/en-us/library/windows/desktop/ff657751.aspx

Diagnostics for Windows
https://msdn.microsoft.com/en-us/library/windows/desktop/ee663269(v=vs.85).aspx

C Sharp Certification Preparation
https://mva.microsoft.com/colleges/c_cert

C Sharp - Useful Links for Cover Gaps of Last Versions

LINQ Query Expressions

https://msdn.microsoft.com/en-us/library/bb397676.aspx

Lambda Expressions

https://msdn.microsoft.com/en-us/library/bb397687.aspx

Nullable Types

https://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx

Managed Threading Best Practices

https://msdn.microsoft.com/en-us/library/1c9txz50(v=vs.110).aspx

Parallel Programming in the .NET Framework

https://msdn.microsoft.com/en-us/library/dd460693(v=vs.110).aspx