protected void Page_Load(Object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                JoinDate.SetValue(DateTime.Now);
                RoleID.DataSource     = db.ExecuteDataTable("SELECT id,name FROM [T_UserRole]");
                RoleID.DataTextField  = "name";
                RoleID.DataValueField = "id";
                RoleID.DataBind();
                RoleID.Items.Insert(0, new ListItem("选择角色", "0"));

                if (IsEdit)
                {
                    LoadData();
                    UserName.Enabled = false;
                    //Req1.Visible = Req2.Visible = false;
                }
            }
        }