I found this tip in an incidental and quick Rebuild when I suddenly notice the extra comma but compiler didn't report any error before I could be able to abort it! I thought it were a nice and kind bug in C# compiler but it's NOT, as shown in C# Language Specification 12.6 (array initializers), 14.1 (enum declarations), 17.2 (attribute specification)!

As in the following examples:

object[] x = new object[] {a, b, c,}

and:

[Obsolete, Flags,]
public enum Y
{
  A,
  B,
  C,
}

which allows you to easily reorder the declaration list by using ^L...^V or Shift-Alt-T in VS.NET:

[Obsolete, Flags,]
public enum Y
{
  A,
  C,
  B,
}

Isn't?this useful and flexible??笑脸 And finally, in keeping with?tradition of leaving you a quiz, does this work for method parameter declaration?

void Method(string x, int y,) {} // WORK OR NOT?