Revert "Fixed C# 5.0 compatibility issue."

This reverts commit ec0bb8efa780b71f03aa7b9ded1b1d504f7b3291.
Revert "Fixed FW 4.5 ToString issue."

This reverts commit c82fdba0dafa941927316f59cf6de9e292a261ee.
Removed unnecessary proj and sln files.