1 private void frmFixeSize_Load(object sender, EventArgs e)
2        {
3            //方法一
4            this.MaximizeBox = false;
5            this.MinimumSize = this.MaximumSize = this.Size;
6            this.FormBorderStyle = FormBorderStyle.FixedSingle;
7        }

protected override void WndProc(ref Message m)
       {
           //方法二
           if (m.Msg == 0xa3)
           {
               return;
           }
           base.WndProc(ref m);
       }