In C# how do I define my own Exceptions?

Question

In C# how do I define my own Exceptions?

Answer 1

Definition:

public class CustomException : Exception
{
   public CustomException(string Message) : base (Message)
   {
   }
}

throwing:

throw new CustomException("Custom exception message");

Answer 2

You can define your own exception.

User-defined exception classes are derived from the ApplicationException class.

You can see the following code:

using System;
namespace UserDefinedException
{
   class TestTemperature
   {
      static void Main(string[] args)
      {
         Temperature temp = new Temperature();
         try
         {
            temp.showTemp();
         }
         catch(TempIsZeroException e)
         {
            Console.WriteLine("TempIsZeroException: {0}", e.Message);
         }
         Console.ReadKey();
      }
   }
}
public class TempIsZeroException: ApplicationException
{
   public TempIsZeroException(string message): base(message)
   {
   }
}
public class Temperature
{
   int temperature = 0;
   public void showTemp()
   {
      if(temperature == 0)
      {
         throw (new TempIsZeroException("Zero Temperature found"));
      }
      else
      {
         Console.WriteLine("Temperature: {0}", temperature);
      }
   }
}

and for throwing an exception,

You can throw an object if it is either directly or indirectly derived from the System.Exception class

Catch(Exception e)
{
   ...
   Throw e
}