public partial class frmJS : Form
    {
        protected override bool ProcessCmdKey(ref   System.Windows.Forms.Message msg, System.Windows.Forms.Keys keyData)   //激活回车键   
        {
            int WM_KEYDOWN = 256;    //???
            int WM_SYSKEYDOWN = 260;  //???
            if (msg.Msg == WM_KEYDOWN | msg.Msg == WM_SYSKEYDOWN)
            {
                switch (keyData)
                {
                    case Keys.Insert:
                        break;
                    case Keys.Enter:
                        return true;
                        break;
                
                }
            }
            return false;
        }