Suspend or resume windows controls to be redrawan

Recently, I was facing an issue with a third-party Image Viewer to apply multiple operations before redrawing the images.
Third-party control was not allowed to suspend and resume the painting of images inherently. After searching for various solutions, I found a solution to fix this issue using the windows message “WM_SETREDRAW“ from an application to Windows to allow changes in that control to be redrawn or to prevent changes in that control from being redrawn.

public class UIDrawController
{
[DllImport("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);

private const int WM_SETREDRAW = 11;


public static void SuspendDrawing(Control ctrl)
{
SendMessage(ctrl.Handle, WM_SETREDRAW, false, 0);
}


public static void ResumeDrawing(Control ctrl)
{
SendMessage(ctrl.Handle, WM_SETREDRAW, true, 0);
ctrl.Refresh();
}
}

Example Usage:

public ImageViewer : UserControl
{
	public void LoadDocument(string filename)
	{
		UIDrawController.SuspendDrawing(this);
		OpenImage(filename);
		FitToWidth();
		Rotate90();
		ApplyImageFilters();
		UIDrawController.ResumeDrawing(this);
	}
}