Forms :: Process MainWindowHandle - Simple GUI Form To Hide / Show / Minimize / Terminate / Force Terminate

I have a simple GUI form to hide / show / minimize / terminate / force terminate Processes. i can do all well but for show and hide i need the MainWindowHandle to show or hide it

So here is hide process code:

Dim Proc As New Process = Process.GetProcessesById(List.SelectedRows(0).Cells(1))
Dim hwnd = Proc.MainWindowHandle
ShowWindow(hwnd,0)

If i try the same with show code:

Dim Proc As New Process = Process.GetProcessesById(List.SelectedRows(0).Cells(1))
Dim hwnd = Proc.MainWindowHandle
ShowWindow(hwnd,9)

The MainWindowHandle become 0 cuz its hidden is there is any other way to get the MainWindowHandle of Process ?