FormCloseDo fdo = new FormCloseDo();//显示关闭选项
                    fdo.ShowDialog();
                    if (ClassUserInformation.iscloseture)
                    {
                        if (ClassUserInformation.closedo == "1") //关闭程序
                        {
                          退出时候相应操作
                           
                        }
                        else //系统托盘
                        {
                            e.Cancel = true;//取消关闭
                            this.WindowState = FormWindowState.Minimized;//最小化
                        }
                    }
                    else
                    {
                        e.Cancel = true;//取消关闭
                    }
                }
                else //不再提醒
                {
                    ClassUserInformation.getUserImformation();//再次读出信息
                    if (ClassUserInformation.closedo == "1") //关闭程序
                    {
                      退出时候相应操作
                    } 轻量级企业运行管理综合系统设计+文献综述(9):http://www.751com.cn/jisuanji/lunwen_2845.html