Clean up issues in a few C# projects, remove Me, ByVal and other code… (

dotnet#1391)

* Clean up issues in a few C# projects, remove Me, ByRef and other code cleanup.

* Fix Snippet while still adding ConfigureGeneratedCodeAnalysis and EnableConcurrentExecution.

* FIx Typo in project file

* Restore DataTime from DAte

* respond to PR feedback

* Fix Byval and spacing in some VB files

* Update Form1.vb

* Update quickcontacts.vb

fix typo on hasOffset variable (dotnet#1458)

Fixed formatting of readme.md for DiagnosticScenarios sample (dotnet#…

…1446)

Removed extra period (dotnet#1398)

Removed extra period (dotnet#1398)

Remove Imports System, part 13 (dotnet#1213)

Disambiguate C# and VB examples (dotnet#1184)

Disambiguate C# and VB examples (dotnet#1184)

Change code language (dotnet#1187)

Update readme.md