[C#] Form 폼 최소화버튼 막기

using System;
using System.Windows.Forms;
using System.ComponentModel;
 
namespace NoMinimizeTest
{
    public class MinimizeControlForm : Form
      {
          private const int WM_SYSCOMMAND = 0x0112;
          private const int SC_MINIMIZE = 0xf020; `
 
        protected MinimizeControlForm()
          {
              AllowMinimize = true;
          }
 
          protected override void WndProc(ref Message m)
          {
              if (!AllowMinimize)
              {
                  if (m.Msg == WM_SYSCOMMAND)
                  {
                      if (m.WParam.ToInt32() == SC_MINIMIZE)
                      {
                          m.Result = IntPtr.Zero;
                          return;
                      }
                  }
              }
              base.WndProc(ref m);
          }
 
          [Browsable(true)]
          [Category("Behavior")]
          [Description("Specifies whether to allow the window to minimize when the minimize button and command are enabled.")]
          [DefaultValue(true)]
          public bool AllowMinimize
          {
              get;
              set;
          }
      }
}