Exception handling

• An exception is a run time error.
  
• Exception Handler
  is a mechanism that handles an exception.
  
• In C# exception handling is managed via try, catch, throw and finally.
  
• Here's the general form of these statements:
  

  Syntax:    try
  

  {
  

      statement(s)
  

  }
  

  catch (exceptiontype name)
  

  {
  

  statement(s)
  

  }
  

  finally
  

  {
  

              statement(s)
  

  }
  

• Program statements that you want to monitor for exceptions are contained within a try block. If an exception occurs within the try block, it is thrown.
  
• Your code can catch these exceptions that are automatically thrown by the run-time system.
  
• The finally statement must be associated with a try statement and identifies a block of statements that are executed regardless of whether or not an error occurs within the try block.
  
• The throw statement is used explicitly to throw an exception.