C# Program to check a string for whitespace characters or null

This method returns true if the entered string has only whitespace characters or is null.

Let’s say you are checking for whitespace character.

bool val1 = string.IsNullOrWhiteSpace(“ “);

The above returns True, since the string is a whitespace character. In the same way, check it for null using the IsNullOrWhiteSpace() method.

Here is the entire example that checks for null and whitespace −

Example

using System;
using System.IO;
public class Demo {
   public static void Main() {
      bool val1 = string.IsNullOrWhiteSpace(“100”);
      bool val2 = string.IsNullOrWhiteSpace(" ");
      bool val3 = string.IsNullOrWhiteSpace(null);
      Console.WriteLine(val1);
      Console.WriteLine(val2);
      Console.WriteLine(val3);
   }
}