Design table with following attribute....

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm4.aspx.cs" Inherits="Gridview.WebForm4" %>





   


   

   

       

       

        

         

       
   

   
   

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace Gridview
{
    public partial class WebForm4 : System.Web.UI.Page
    {
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
        string str;

        protected void Button1_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(connStr);
            con.Open();
            str = "update item  set Item_Rate='" + TextBox3.Text + "',ltem_Qty='" + TextBox4.Text + "'where ltem_ld='" + TextBox1.Text + "' and  ltem_Name='" + TextBox2.Text + "'";
            com = new SqlCommand(str, con);
            com.ExecuteNonQuery();
            con.Close();
            Response.Write("Updated");
        }
    }
}