Difference between IsNullOrEmpty and IsNullOrWhiteSpace in C# [duplicate]

• Source: MSDN

IsNullOrWhiteSpace is a convenience method that is similar to the
following code, except that it offers superior performance:

return String.IsNullOrEmpty(value) || value.Trim().Length == 0;

White-space characters are defined by the Unicode standard. The
IsNullOrWhiteSpace method interprets any character that returns a
value of true when it is passed to the Char.IsWhiteSpace method as a
white-space character.