Difference between !string.isnullorempty and "" && null

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!string.isnullorempty check NULL value and empty string like "" and also white space char but varname!="" means only empty string.

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. String.IsNullOrEmpty(string value) returns true if the string is null or empty. For reference an empty string is represented by "" (two double quote characters)