Like any other programming language, in C#, you can easily create user-defined exception. User-defined exception classes are derived from the Exception class.
In the below example, the exception created is not a built-in exception.
TempIsZeroException
You can try to run the following code to learn how to create user defined exception in C#.
using System; namespace Demo { 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); } } }
TempIsZeroException: Zero Temperature found