Difference between !string.isnullorempty and && null

Question

Hi Friends What is the difference between !string.isnullorempty and varname!= and varname!=null. Which one is good and how?

Blackbarbie Bb · Answer

accept my answer if it worked for u

Ravikumar G · Answer

Thanks

Ravikumar G · Answer

Thanks

Shuvojit Halder · Answer

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

Blackbarbie Bb · Answer

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)

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