ref vs out parameter

ref Before passing ref parameter the sender class must instantiate the ref argument, so ref requires additional bandwidth to send the object both ways. ref allows the called methods to modify the object to which the reference refers because the reference itself is being passed by reference. Details at: http://msdn2.microsoft.com/en-us/library/14akc2c7(VS.80).aspx out An out argument is created by the called method and it is returned to the caller. Declaring an out method is useful when you want a method to return multiple values. A method that uses an out parameter can still a variables as a return type but it can also return one or more objects to a calling method as out parameters. Details at: http://msdn2.microsoft.com/en-us/library/t3c3bfhx(VS.80).aspx