C# - Create Custom Exception

How to create a custom exception message in C#

Sample from http://www.blackwasp.co.uk/CSharpThrowingExceptions.aspx


using System;

namespace BlackWasp
{
class TestApp
{
static void Main(string[] args)
{
// Check that a parameter was provided
if (args.Length == 0)
{
throw new ArgumentException("A start-up parameter is required.");
}

Console.WriteLine("{0} argument(s) provided", args.Length);
}
}
}