private void doPost() { string cname = Request["cname"]; light.BLL.leftmenu bll = new light.BLL.leftmenu(); if (!bll.Exists(cname)) { model = bll.GetModel(int.Parse(ViewState["pid"].ToString())); model.cnname = cname; bll.Update(model); WebMessageBox.ShowMessageBox("修改成功", this); } else { WebMessageBox.ShowMessageBox("该菜单名已经存在", this); } }