Retriev data from database and display in the web form

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





   


   

   

   
       
   

   

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 _Default : System.Web.UI.Page
    {
        string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
        SqlDataAdapter sqlda;
        DataSet ds;
        string str;

        protected void Page_Load(object sender, EventArgs e)
        {
            bindgrid();
        }
        private void bindgrid()
        {
            SqlConnection con = new SqlConnection(connStr);
            con.Open();
            str = "select * from employee";
            com = new SqlCommand(str, con);
            sqlda = new SqlDataAdapter(com);
            ds = new DataSet();
            sqlda.Fill(ds, "employee");
            g1.DataMember = "employee";
            g1.DataSource = ds;
            g1.DataBind();
            con.Close();
        }
    }
}

Please show the code that you have tried.
You should Try this:-
protected void Itemsearchgrid_SelectedIndexChanged(object sender, EventArgs e)
    {
        try
        {
            txtplno.ReadOnly = true;
            txtplno.Text = Itemsearchgrid.SelectedRow.Cells[1].Text.ToString();
            txtdescp.Text = Itemsearchgrid.SelectedRow.Cells[2].Text.ToString();
            txtaac.Text = Itemsearchgrid.SelectedRow.Cells[8].Text.ToString();
            Txtrmrks.Text = Itemsearchgrid.SelectedRow.Cells[11].Text.ToString();
            fromyearlist.SelectedIndex = 0;
        }
        catch(Exception ex)
        {}

    }