class Debugging
    {
        static string[] eTypes = { "none", "simple", "index", "nested index" };
        static void ThrowException(string exceptionType)
        {
            Console.WriteLine("Throw exception (\"{0}\") reached" + exceptionType);
            switch (exceptionType)
            {
                case "none":
                    Console.WriteLine("Not throwing an exception");
                    break;
                case "simple":
                    Console.WriteLine("Throwing System.Exception");
                    throw(new System.Exception());
                    break;
                case "index":
                    Console.WriteLine("Throwing System.IndexOutOfRangeException.");
                    eTypes[4] = "error";
                    break;
                case "nested index":
                    try
                    {
                        Console.WriteLine("ThrowException(\"nested index\") " + "try block reached.");
                        Console.WriteLine("ThrowException(\"index\") called.");
                        ThrowException("index");
                    }
                    catch
                    {
                        Console.Write("ThrowException(\"nested index\") general" + " catch block reached.");
                    }
                    finally
                    {
                        Console.WriteLine("ThrowException(\"nested index\") finally" + " block reached.");
                    }
                    break;
            }

        }
        static void Main(string[] args)
        {
            foreach (string eType in eTypes)
            {
                try
                {
                    Console.WriteLine("Main() try block reached.");
                    Console.WriteLine("ThrowException(\"{0}\") called.", eType);
                    ThrowException(eType);
                    Console.WriteLine("Main() try block continues.");
                }
                catch (System.IndexOutOfRangeException e)
                {
                    Console.WriteLine("Main() System.IndexOutOfRangeException catch" + " block reached. Message:\n\"{0}\"", e.Message);
                }
                catch
                {
                    Console.WriteLine("Main() general catch block reached.");
                }
                finally
                {
                    Console.WriteLine("Main() finally block reached.");
                }
                Console.WriteLine();
            }
        }
    }

________________________________________________________________________________
_____________________________________________
    class MyClient
    {
         public static void Main()
         {
             int x = 0;
             int div = 0;
             try
                {
                 div = 100 / x;
                 Console.WriteLine("This line in not executed");
                }
             catch (DivideByZeroException de)
                {
                 Console.WriteLine("Exception occured");
                }
             finally
                {
                 Console.WriteLine("Finally Block");
                }
          }
    }

________________________________________________________________________________
_____________________________________________
public class ThrowTest
{
   public static void Main()
   {
      string s = null;

      if (s == null)
      {
         throw(new ArgumentNullException());
      }

      Console.Write("The string s is null"); // not executed
   }
}

________________________________________________________________________________
___________________________________________________________
using System.IO;
   FileStream objStream = new FileStream("C:\\AppLog.txt", FileMode.OpenOrCreate);
   TextWriterTraceListener objTraceListener = new TextWriterTraceListener(objStream);
   Trace.Listeners.Add(objTraceListener);
   Trace.WriteLine("This is first trace message");
   Trace.WriteLine("This is second trace message");
   Debug.WriteLine("This is first debug message");
   Trace.Flush();
   objStream.Close();