In C# how do I define my own Exceptions?

Question

In C# how do I define my own Exceptions?

Answer 1

You can create custom exception by using "Exception" class as base class

public class TestCustomException: Exception
{  

  public TestCustomException(string message, Exception inner)
    : base(message, inner)
  {

  } 
}

Complete Console Example

class TestCustomException : Exception
{

    public TestCustomException(string message) : base(message)
    {
        this.HelpLink = "Sample Link details related to error";
        this.Source = "This is source of Error";
    }

}

class MyClass
{
    public static void Show()
    {
        throw new TestCustomException("This is Custom Exception example in C#");
    }
}
class Program
{
    static void Main(string[] args)
    {
        try
        {
            MyClass.Show();
        }
        catch (TestCustomException ex)
        {
            Console.WriteLine("Error Message:-" + ex.Message);
            Console.WriteLine("Hyper Link :-" + ex.HelpLink);
            Console.WriteLine("Source :- " + ex.Source);
            Console.ReadKey();
        }
    }
}

Source : Creating C# Custom Exception (With Console application example)