点击修改是显示类别名称,标题和内容

                //显示标题和内容
                string newsid=Request.QueryString["newsid"];
                newsModel n = new NewsBLL().SelectNew(newsid);
                txttitle.Text = n.Title;
                FreeTextBox1.Text = n.Content;
                ddlcategory.SelectedValue = n.Caid;