FIX: An application that uses MDI Child Forms and menus leaks Win32 resources (330203)

MORE INFORMATION

Steps to reproduce the problem

1. Create a Windows Application by using Microsoft Visual C# .NET.
2. Add an MDI Child Form, and then set the value of the IsMdiContainer property to True in the Properties window.
3. Add a Form that is named ChildForm, and then add five MainMenu controls to the ChildForm form.
4. Add eight menu items to each MainMenu control.
5. Add a MainMenu control with the following text to the MDI Child Form:

   Test Menu Resource Leak

6. Add a menu item that is named menuItemCreateChilds with the text "Create Child Windows" to the MainMenu control that you added in step 5, and then add the following event handler:

   private void menuItemCreateChilds_Click(object sender, System.EventArgs e) {
   				for(int i=0; i<20; i++)
   				{
   					ChildForm child = new ChildForm();
   					child.MdiParent = this;
   					child.Show();
   				}
   		}
   

7. Add a menu item that is named menuItemCloseChilds wth the text "Close Child Windows" to the MainMenu control that you added in step 5, and then add the following event handler:

   		private void menuItemCloseChilds_Click(object sender, System.EventArgs e) 
   		{
   			while(MdiChildren.Length>0)
   			{
   				MdiChildren[0].Close();
   				MdiChildren[0].Dispose();
   			}
   			GC.Collect();
   			GC.WaitForPendingFinalizers();
   		}
   
   

8. Open Windows Task Manager.
9. Click the Process tab
10. On the View menu, click Select Columns.
11. In the Select Columns dialog box, click to select the USER Objects check box, and then click OK to add the column to the process list.
12. In Visual Studio .NET, build and then run the Windows Application project.
13. Click Create Child Windows several times, and then click Close Child Windows several times. You will notice a large increase in the USER Objects of the application in Task Manager.