Admin/EditOrder.aspx.cs

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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;
public partial class Admin_EditOrder : System.Web.UI.Page
{
    SqlHelper sqloperate = new SqlHelper();
    SqlConnection sqlconn = new SqlConnection(  ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            gvbind();
        }
    }
    protected void lbtnBack_Click(object sender, EventArgs e)
    {
        Response.Redirect("OrderList.aspx");
    }
    protected void gvPOInfo_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        gvPOInfo.PageIndex = e.NewPageIndex;
        gvbind();
    }
    public void gvbind()
    {
        sqlconn.Open();
        try
        {
            string strname = "select OrderID,OrderMember from OrderInfo where OrderMember='" + Request["OrderMember"].ToString() + "'";
            SqlDataAdapter mydaname = new SqlDataAdapter(strname, sqlconn);
            DataSet mydsname = new DataSet();
            mydaname.Fill(mydsname, "OrderInfo");
            DataRowView mydrvname = mydsname.Tables["OrderInfo"].DefaultView[0];
            string sqlstr = "select count(GoodsName) as TNum,sum(GoodsPrice) as TPrice from OrderInfo where OrderMember='"
                + Convert.ToString(mydrvname.Row["OrderMember"]) + "'";
            SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlconn);
            DataSet myds = new DataSet();
            myda.Fill(myds, "OrderInfo");
            DataRowView mydrv = myds.Tables["OrderInfo"].DefaultView[0];
            txtONum.Text = Convert.ToString(mydrv.Row["TNum"]);
            txtOTPrice.Text = Convert.ToString(mydrv.Row["TPrice"]);
            string sqlstrpart = "select * from OrderInfo where OrderMember='"
                + Convert.ToString(mydrvname.Row["OrderMember"]) + "'";
            SqlDataAdapter mydabind = new SqlDataAdapter(sqlstrpart, sqlconn);
            DataSet mydsbind = new DataSet();
            mydabind.Fill(mydsbind, "OrderInfo");
            DataRowView mydrvbind = mydsbind.Tables["OrderInfo"].DefaultView[0];
            txtOMember.Text = Convert.ToString(mydrvbind.Row["OrderMember"]);
            sqloperate.gvDataBind(gvPOInfo, sqlstrpart);
            string sqlstrminfo = "select user_phone,user_add from users where user_name='" + txtOMember.Text.Trim() + "'";
            SqlDataAdapter mydaminfo = new SqlDataAdapter(sqlstrminfo, sqlconn);
            DataSet mydsminfo = new DataSet();