Online Resources

learn.microsoft.com/en-us/dotnet/csharp/
learn.microsoft.com/en-us/dotnet/csharp/programming-guide/
c-sharpcorner.com/topics/c-sharp-tutorial
dotnetperls.com
programmerall.com/article/5847603666/	Excel Interop
tutorialspoint.com/csharp/index.htm
tutorialsteacher.com/csharp/csharp-version-history	C# Version History
w3schools.com/cs/index.php