C# Online Compiler | .NET Fiddle

using System;

namespace CustomExceptionHandling
{
   //Custom User defiened Exception Created here, using Exception as base class
    public class TestCustomException : Exception
    {
       
        public TestCustomException(string message) : base(message)
        {
            this.HelpLink = "Visit to qawithexperts.com for more information";
            this.Source = "This is source of Error";
        }
       
    }
    
	//Usual Class with method Show(), which throws Exception with message
    public class MyClass
    {
        public static void Show()
        {
            throw new TestCustomException("This is Custom Exception example in C#");
        }
    }
	
    public class Program
    {
        public static void Main(string[] args)
        {
			//enclose method inside try
            try
            {
                MyClass.Show();
            }
			//catch User defined Exception
            catch (TestCustomException ex)
            {
                //Show Custom defined Error messages
                Console.WriteLine("Error Message:-" + ex.Message);
                Console.WriteLine("Hyper Link :-" + ex.HelpLink);
                Console.WriteLine("Source :- " + ex.Source);
               
            }
        }
    }
}

 
using System;
​
namespace CustomExceptionHandling
{
   //Custom User defiened Exception Created here, using Exception as base class
    public class TestCustomException : Exception
    {
       
        public TestCustomException(string message) : base(message)
        {
            this.HelpLink = "Visit to qawithexperts.com for more information";
            this.Source = "This is source of Error";
        }
       
    }
    
    //Usual Class with method Show(), which throws Exception with message
    public class MyClass
    {
        public static void Show()
        {
            throw new TestCustomException("This is Custom Exception example in C#");
        }
    }