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C# program to demonstrate the NullReferenceException

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mahmoud2506
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2022-05-14
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C# program to demonstrate the NullReferenceException

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mahmoud2506
2022-05-14
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Program:

The source code to demonstrate the null reference exception is given below. The given program is compiled and executed successfully on Microsoft Visual Studio.

//C# program to demonstrate the null reference exception.

using System;

class ExceptionDemo
{
    void PrintHello()
    {
        Console.WriteLine("Hello World");
    }
    static void Main()
    {
        try
        {
            ExceptionDemo E = new ExceptionDemo();

            E = null;
            E.PrintHello();
        }
        catch (NullReferenceException e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

Output:

Object reference not set to an instance of an object.
Press any key to continue . . .

Explanation:

In the above program, we created a class ExceptionDemo that contains two methods PrintHello() and Main(). The PrintHello() message will print "Hello World" on the console screen.

In the Main() method, we created an object E in the "try" block. Then we assigned the value "null" to the reference E and then call PrintHello() method with a null reference. That's why the NullReferenceException exception gets generated and caught by the "catch"  block that will print the exception message on the console screen.

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