How to throw an exception during debugging session in VS2010

I have a small issue. Sometimes when I debug an application I want to simulate during the debug session an exception thrown from a method, but there is no way to do it. I can't even drag the cursor (the yellow one that indicate the current line) to an exception block. The only way to trigger an exception during the run is to change the current line of code and to write the exception I want to throw. This method is not good because I might forget to change it back in the next run.