Customl Exception C# with Example

 	using System;

	namespace CSharpExceptionHandling{
		public class WatchException : ApplicationException{
			private string messageDetails = String.Empty;
			public DateTime ErrorTimeStamp {get; set;}
			public string CauseOfError {get; set;}
			
			public WatchException(){}
			public WatchException(string msg, string cause, DateTime time){
				messageDetails = msg;
				CauseOfError = cause;
				ErrorTimeStamp = time;
			}
			
			// Override the Exception.Message property.
			public override string Message{
				get{
					return string.Format("Watch Error Message: {0}", messageDetails);
				}
			}
		}
		
		class Watch	{
			public byte hour{set; get;}	
			public byte minute{set; get;}

			public Watch(){
				hour = 12;
				minute = 0;
			}
			
			public void SetTime(byte h, byte m)
			{
				try{
					if(h > 23){
						WatchException exp = new WatchException(
							string.Format("Invalid Time Specified."), 
							string.Format("Hour is {0}, which can't be more then 23", h), 
							DateTime.Now
						);
						exp.HelpLink = "http://www.bccfalna.com/";
						throw exp;
					}
					else{
						hour = h;
						minute = m;
					}
				}
				catch(WatchException exp){
					Console.WriteLine("Error Description: " + exp.Message);
					Console.WriteLine("Cause of Error: " + exp.CauseOfError);
					Console.WriteLine("Time of Error: " + exp.ErrorTimeStamp);
				}
			}
			
			public void DisplayTime()
			{
				Console.WriteLine(hour + ":" + minute);
			}
		}
			
		class UsingWatchException{
			static void Main(String[] arg){
				Watch hmt = new Watch();
				hmt.SetTime(30,10);
				Console.Write("Time of the HMT Watch is: ");
				hmt.DisplayTime();
			}
		}
	}