小测试，出问题

Question

void Page_Load(Object sender,EventArgs E)
     {
      string  strconn="server=yangjh;uid=sa;pwd=;database=BookShop";
      string strSQL="select * from UserInfo";
      System.Data.SqlClient.SQLConnect cnSQL =new System.Data.SqlClient.SQLConnect(strconn);
      System.Data.SqlClient.SQLDataSetCommand cmdsql=new System.Data.SqlClient.SQLDataSetCommand(strSQL,cnSQL);
      DataSet ds=new DataSet();
      cmdsql.FillDataSet(ds,"UserInfo");
      DataGrid1.DataSource=ds.Tables;
      DataGrid1.DataBind();
      }