Transparent cover to prevent mouse operation in Windows Forms application.

TransparentCover.cs

using System;
using System.Windows.Forms;

namespace OaktreeLab.Utils {
    public class TransparentCover : Panel {
        private const int WS_EX_TRANSPARENT = 0x00000020;

        protected override CreateParams CreateParams {
            get {
                CreateParams param = base.CreateParams;
                param.ExStyle |= WS_EX_TRANSPARENT;
                return param;
            }
        }

        protected override void OnPaintBackground( PaintEventArgs e ) {
        }
    }
}