FirstChanceExceptionEventArgs Class

Provides data for the notification event that is raised when a managed exception first occurs, before the common language runtime begins searching for event handlers.

The following Code will demonstrate the working of FirstChanceExceptionEventArgs Class.
 

class Worker : MarshalByRefObject

{

public void raiseException()

{

try

{

throw new Exception("I am Exception");

}

catch { }

}

}

 

class Program

{

        static void Main(string[] args)

        {

            AppDomain.CurrentDomain.FirstChanceException += new EventHandler<System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs>(CurrentDomain_FirstChanceException);

            AppDomain newDomain = AppDomain.CreateDomain("AD01");

            newDomain.FirstChanceException += new EventHandler<System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs>(newDomain_FirstChanceException);

 

            Assembly assem = Assembly.GetExecutingAssembly();

            Worker worker = (Worker)newDomain.CreateInstanceAndUnwrap(Assembly.GetExecutingAssembly().FullName, "TuplePractice.Worker");

            worker.raiseException();

            int k = 0;

            int i = 1;

            try

            {

                i = 1 / k;

            }

            catch

            {

                Console.WriteLine("First Exception occurs");

            }

            try

            {

                i = 1 / k;

            }

            catch

            {

                Console.WriteLine("Second Exception occurs");

            }

            return;

        }

        static void newDomain_FirstChanceException(object sender, FirstChanceExceptionEventArgs e)

        {

            Console.WriteLine("FirstChanceException event raised in {0}: {1}", AppDomain.CurrentDomain.FriendlyName, e.Exception.Message);

        }

        static void CurrentDomain_FirstChanceException(object sender, FirstChanceExceptionEventArgs e)

        {

            Console.WriteLine("FirstChanceException event raised in {0}: {1}", AppDomain.CurrentDomain.FriendlyName, e.Exception.Message);

        }

}

Output

FirstChanceException event raised in AD01: I am Exception

FirstChanceException event raised in TuplePractice.exe: Attempted to divide by zero.

First Exception occurs

FirstChanceException event raised in TuplePractice.exe: Attempted to divide by zero.

Second Exception occurs

Press any key to continue . . .

Remarks
Output of the porgram shows that all registerd event handlers of AppDomain.CurrentDomain.FirstChanceException  are triggered prior to the catch block of respectice try block.
Further details can be found here.