User-Defined Exception Classes : Custom Exception « Language Basics « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Language Basics
3. Custom Exception

using System;

public class CountIsZeroException: ApplicationException{
    public CountIsZeroException(){
    }
    public CountIsZeroException(string message) : base(message)
    {
    }
    public CountIsZeroException(string message, Exception inner) : base(message, inner)
    {
    }
}

class MainClass{
    public static void Main() {
        try {
            DoAverage();
        }
        catch (CountIsZeroException e)
        {
            Console.WriteLine("CountIsZeroException: {0}", e);
        }
    }
    public static void DoAverage() {
        throw(new CountIsZeroException("Zero count in DoAverage"));
    }

}

CountIsZeroException: CountIsZeroException: Zero count in DoAverage
   at MainClass.DoAverage()
   at MainClass.Main()