ArgumentNullException in .NET
In this article we will explain how we can handle the ArgumentNullException in .NET.
Introduction
Exception handling is very common in programs. Exceptions are used to indicate that an error has occurred while running the program. ArgumentNullException is thrown in case when a null reference is passed to a method that does not accept it as a valid argument. Computers can't handle this situation without using exception handling so its gives an error or Exception. This exception is called ArgumentNullException.
Example
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace application
{
class MainClass
{
static void a(string s)
{
if (s == null)
{
throw new ArgumentNullException();
}
}
static void Main()
{
try
{
string s = null;
a(s);
}
//catch (ArgumentNullException e)
//{
// Console.WriteLine("{0} exception caught.", e);
//}
catch (ArgumentNullException ex)
{
Console.WriteLine(ex);
Console.WriteLine("HelpLink = {0}", ex.HelpLink);
Console.WriteLine("Message = {0}", ex.Message);
Console.WriteLine("Source = {0}", ex.Source);
Console.WriteLine("StackTrace = {0}", ex.StackTrace);
Console.WriteLine("TargetSite = {0}", ex.TargetSite);
}
finally
{
Console.WriteLine("Task completed");
}
Console.ReadLine();
}
}
}
The output of following program
