GC.Collect（）是否处理Font（或任何已实现IDisposable的实例）对象.net 4.0 C＃memory leak

I have a C# .net 4.0 user control which uses lots of fonts and graphics object. This control is opened and closed multiple times and it leak memory. I am calling GC.Collect in the Dispose of this control. My Question is if System.Graphics object for e.g. Font, Brush are used without "Using" or without Disposing it explicitly, is GC.Collect() going to clear that objects tool.I have a C# .net 4.0 user control which uses lo