private static bool IsValidWindow(IntPtr hWnd) { // Basic WS_VISIBLE check if (!NativeMethods.IsWindowVisible(hWnd)) { return(false); } // Actually visible? if (!NativeMethodsHelper.IsActiveAndReallyVisibleTopLevelWindow(hWnd)) { return(false); } // Remove notification icon programs and "Program Manager" if (NativeMethodsHelper.IsProgramManagerOrHiddenTrayWindow(hWnd)) { return(false); } // Not a tool window if (NativeMethodsHelper.IsToolWindow(hWnd)) { return(false); } // Not cloaked if (NativeMethodsHelper.IsWindowCloaked(hWnd)) { return(false); } return(true); }