source: Common/SuspendDrawing.cs

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Common
{
    class SuspendDrawing
    {
        [DllImport("user32.dll")]
        private static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);
        private const int WM_SETREDRAW = 11;

        public static void Suspend(Control parent)
        {
            if (parent.Visible) SendMessage(parent.Handle, WM_SETREDRAW, false, 0);
        }

        public static void Resume(Control parent)
        {
            if (parent.Visible) SendMessage(parent.Handle, WM_SETREDRAW, true, 0);
            parent.Refresh();
        }

        public static void ExecuteAction(Control parent, Action action)
        {
            Suspend(parent);
            try
            {
                action();
            }
            finally
            {
                Resume(parent);
            }
        }
    }
}