I Receive an "InvalidOperationException: Cannot call Invoke or InvokeAsync on a control until the window handle has been created" when closing VB.Net Project in Studio.Net. My design was created using the data form wizard with one parent table and three child tables. Datagrids are used to interface to the three child tables. I even tried creating a new project using the same technique and the error appeared there as well. This error seemed to appear out of nowhere, and my application still functions correctly with the database it connects to. The error only appears when you attempt to close the project down in the Development environment. Any help or ideas on what caused this? Thanks for your help!