C#编程GridView1与查询相冲突

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.Services.Description;

namespace WebApplication2
{
public partial class _Default : System.Web.UI.Page
{
public class UsingConfigurations
{
SqlConnection sqlcon = new SqlConnection(ConfigurationManager.AppSettings["sqlstr"]);

}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
String strcn = "Data Source=.;Initial Catalog=图书馆系统;Integrated Security=True";
SqlConnection cn = new SqlConnection(str

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