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How to check an empty string in C#

Hi experts
I am trying to check for an empty string but I wonder why the following doesn't work.
  string s = "  "; // two empty spaces.
  bool flag = string.IsNullOrEmpty(s); // gives false.
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Guy Hengel [angelIII / a3]
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dominicwong

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I forgot to mention that mine is .NET 3.5
Thanks to the prompts responses and help from everyone. I appreciate that.