锁定计算机

//锁定计算机
[DllImportAttribute("user32.dll")]
public static extern void LockWorkStation();

禁止关闭计算机
private const int WM_QUERYENDSESSION = 0x0011;//windows消息
        int flag = 0;//标识变量
        protected override void WndProc(ref System.Windows.Forms.Message e)
        {
            if (e.Msg == WM_QUERYENDSESSION)
            {
                e.Result = (IntPtr)flag;
            }
            base.WndProc(ref e);
        }
        /// <summary>
        /// 禁止关闭计算机
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void NoShutdown_Click(object sender, EventArgs e)
        {
            flag = 0;
        }