C# String IsNullOrWhiteSpace()

The C# IsNullOrWhiteSpace() method is used to check whether the specified string is null, or consists only of white-space characters. It returns boolean value either True or False.

Signature

Parameter

str: it is a string parameter which is used to check null, white-space in string.

Return

It returns boolean value.

C# String IsNullOrWhiteSpace() Method Example

using System; 
    public class StringExample  
     {  
        public static void Main(string[] args) 
        {  
           string s1 = "Hello C#";
           string s2 = "";
           string s3 = " ";
           bool b1 = string.IsNullOrWhiteSpace(s1);
           bool b2 = string.IsNullOrWhiteSpace(s2);
           bool b3 = string.IsNullOrWhiteSpace(s3);
           Console.WriteLine(b1);		// returns False 
           Console.WriteLine(b2);		// returns True 
           Console.WriteLine(b3);		// returns True 
       }  
    }  

Output: