How to Check if an Object Is Null in C#

1. Check Null Object With the == Operator in C#
2. Check Null Object With the is Keyword in C#

This tutorial will discuss methods to check whether an object is null or not in C#.

Check Null Object With the == Operator in C#

The binary operator == can check whether the value on the left side of the operator is equal to the value on the right side of the operator in C#. The following code example shows us how to check whether an object is null or not with the == operator in C#.

using System;

namespace check_null_object {
  class Program {
    static void Main(string[] args) {
      string check = null;
      if (check == null) {
        Console.WriteLine("check is null");
      } else {
        Console.WriteLine("check is not null");
      }
    }
  }
}

Output:

check is null

The above code checks whether the string variable check is null or not with the == binary operator in C#.

Check Null Object With the is Keyword in C#

We can also use the is keyword to check whether an object is null or not in C#. The is keyword is used as an alternative of the binary operator == in C#. The following code example shows us how we can determine whether an object is null or not with the is keyword in C#.

using System;

namespace check_null_object {
  class Program {
    static void Main(string[] args) {
      string check = null;
      if (check is null) {
        Console.WriteLine("check is null");
      } else {
        Console.WriteLine("check is not null");
      }
    }
  }
}

Output:

check is null

The above code checks whether the string variable check is null or not with the == binary operator in C#.