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string goodsName = this.GridView1.DataKeys[e.RowIndex][0].ToString();
string  salePrice = ((TextBox)this.GridView1.Rows[e.RowIndex].Cells[1].Controls[0]).Text.ToString();
string discount = ((TextBox)this.GridView1.Rows[e.RowIndex].Cells[2].Controls[0]).Text.ToString();
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C# code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

namespace WebTest
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

public void getData()
{
SqlConnection cn = new SqlConnection("server=localhost;database=student;user=xie;password=xie");
SqlCommand cmd = new SqlCommand("select*from goods", cn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, "goods");
this.GridView1.DataSource = ds.Tables[0].DefaultView;
this.DataBind();
}

protected void Button1_Click(objec