/==============================
Check for empty string 
 string s = "hello";

  // Test if a string is neither null nor empty. This has to be a static
  // memeber of the String class because the object may be null!
  if ( !String.IsNullOrEmpty( s ) ) ...

  // Test if a string is empty.
  if ( s.Length != 0 ) ...

  // Test if a string is empty. (another way, more explicit way to do it)
  if ( s != String.Empty ) ...

Check for An Empty String

C#