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Creating User-Defined Exceptions

You can also define your own exception. User-defined exception classes are derived from the Exception class. The following example demonstrates this −

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: Exception { 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); } } }

When the above code is compiled and executed, it produces the following result −

TempIsZeroException: Zero Temperature found