Removes all occurrences of a set of characters specified
      in a Unicode character Array from the
      end of the current instance. 
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Parameters
- trimChars
- An array of Unicode characters. Can be a null reference. 
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Returns
A new string equivalent to the current instance with characters in
trimChars removed from its end. If trimChars is a null reference, white space
   characters are removed. 
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Remarks
Requirements
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0