Question

if a condition occurs i have to stop the execution of the current method call and return to the state before the method call .how can i do it .. suppose a i am executing some sample method and a condition occurs and i am prompting a message box and then i want to return to state before this function call

Answer 1

You can use the Memento pattern to implement object rollback. From here …

The caretaker is going to do something
to the originator, but wants to be
able to undo the change. The caretaker
first asks the originator for a
memento object. Then it does whatever
operation (or sequence of operations)
it was going to do. To roll back to
the state before the operations, it
returns the memento object to the
originator.

Once you receive the event that indicates that you should roll back, you can undo the change and return to the caller. Here is some info. and links on why you should not use Thread.Abort.