Avoiding disposing system-defined Pen and Brush instances

Question

I understand it is best practise to call Dispose() on instances of Pen and Brush, except if they\'ve been set to the system-predefined values (eg. System.Drawing.Brushes, Syste

Answer 1

When you are finished with a Graphics object that you create, you must dispose of it by calling its Dispose method. (This rule is true for many different GDI+ objects.) Don't keep it around for a rainy day because it won't be valid later. You must, must, must dispose of it when you are finished with it. If you don't, it could result in image corruption, memory usage issues, or worse yet, international armed conflict. So, please dispose of all Graphics objects properly.

If you create a Graphics object within an event, you really need to dispose of it before exiting that event handler. There is no guarantee that the Graphics object will still be valid in a later event. Besides, it's easy to re-create another Graphics object at any time.

Got from here http://msdn.microsoft.com/en-us/library/orm-9780596518431-01-18.aspx