Best way to check if string is null or empty in C#

Updated on August 10, 2015     Kisan Patel

The IsNullOrEmpty method is a very convenient method in that you can check if string is null or zero length.

The IsNullOrEmpty method returns true if the string is Null or Empty Otherwise, this method returns false.

string stringTestResult = "";
if (String.IsNullOrEmpty(stringTestResult))
{
    Console.WriteLine("String is null or empty");
}

There is an another convenient method called String.IsNullOrWhiteSpace that returns true if string is null, empty, or consists only of white-space characters otherwise false.

string stringTestResult = " ";
if (String.IsNullOrWhiteSpace(stringTestResult))
{
    Console.WriteLine("String is null or empty or contain whitespace");
}