Call Dispose when you are finished using the ColumnHeader. The Dispose method leaves the ColumnHeader in an unusable state. After calling Dispose, you must release all references to the ColumnHeader so the memory it was occupying can be reclaimed by garbage collection.
Always call Dispose before you release your last reference to the ColumnHeader. Otherwise, the resources the ColumnHeader is using will not be freed until garbage collection calls the ColumnHeader object's destructor.