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How to Determine if a C# String is Empty, Null, or WhiteSpace - C# Station
1 Working with String Duo Wei CS110A_ Empty Strings An empty string has no characters; its length is 0. Not to be confused with an uninitialized. - ppt download
c# - string.IsNullOrEmpty returns true when supplied string is not null - Stack Overflow
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Test PowerShell Variable for Null, Empty String, and White Space