See this

The try-catch statement consists of a try block followed by one or more catch clauses, 
which specify handlers for different exceptions. 
This statement takes one of the following forms:

try try-block 
catch (exception-declaration-1) catch-block-1 
catch (exception-declaration-2) catch-block-2 
...
try try-block catch catch-block

where: 

try-block 
Contains the code segment expected to raise the exception. 
exception-declaration, exception-declaration-1, exception-declaration-2 
The exception object declaration. 
catch-block, catch-block-1, catch-block-2 
Contains the exception handler. 

e.g.;

using System;

public class Example13_4
{

  public static void Main()
  {

    try
    {

      int[] myArray = new int[2];
      Console.WriteLine("Attempting to access an invalid array element");
      myArray[2] = 1;

    }
    catch (DivideByZeroException e)
    {

      // code that handles a DivideByZeroException
      Console.WriteLine("Handling a System.DivideByZeroException object");
      Console.WriteLine("Message = " + e.Message);
      Console.WriteLine("StackTrace = " + e.StackTrace);

    }
    catch (IndexOutOfRangeException e)
    {

      // code that handles an IndexOutOfRangeException
      Console.WriteLine("Handling a System.IndexOutOfRangeException object");
      Console.WriteLine("Message = " + e.Message);
      Console.WriteLine("StackTrace = " + e.StackTrace);

    }
    catch (Exception e)
    {

      // code that handles a generic Exception: all other exceptions
      Console.WriteLine("Handling a System.Exception object");
      Console.WriteLine("Message = " + e.Message);
      Console.WriteLine("StackTrace = " + e.StackTrace);

    }

  }

}

http://msdn.microsoft.com/en-us/library/0yd65esw(VS.71).aspx

Best Luck!!!!!!!!!!!!!!!!!!!
Sujit.