Prevent MDI Child from Flickering

//
// Taken from https://cborrow.wordpress.com/2009/11/13/c-remove-flicker-in-mdi-applications/
//


const int WM_NCPAINT = 0x85;
const int WM_SIZE = 0x05;


//Add this to MDI CHILD FORM
protected override void WndProc(ref Message m)
{
    if (m.Msg == WM_NCPAINT)
    {
        if (this.WindowState == FormWindowState.Maximized)
            return;
    }

    if (m.Msg == WM_SIZE)
    {
        if (this.WindowState == FormWindowState.Maximized)
            return;
    }

    base.WndProc(ref m);
}