can we do this without using querystring,,,please provide me code...

can we do this without using querystring,,,please provide me 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.SqlClient;
using System.Data;
using System.Configuration;

namespace WebApplication1
{
    public partial class editpage : System.Web.UI.Page
    {
        SqlConnection conn = new SqlConnection(@"Data Source=SRAVI-PC\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=True");
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                BindDetails();
            }
        }
        private void BindDetails()
        {
            lblid.Text = Request.QueryString["Id"];
//            txtid.Text = Request.QueryString["Id"];
            txtfname.Text = Request.QueryString["FirstName"];
            txtlname.Text = Request.QueryString["LastName"];
        }
        
        protected void btnsave_Click(object sender, EventArgs e)
        {
            int id1 = Convert.ToInt32(lblid.Text);
//            int id = Convert.ToInt32(txtid.Text);
            string fna = txtfname.Text;
            string lna = txtlname.Text;
            string cmd = "update namestb set FirstName='" + fna + "',LastName='"+lna+"'where Id="+id1;
            SqlCommand command = new SqlCommand(cmd, conn);
            conn.Open();
            command.ExecuteNonQuery();
            conn.Close();
            Response.Redirect("displaypage.aspx");
        }

        protected void btncancel_Click(object sender, EventArgs e)
        {
            Response.Redirect("displaypage.aspx");
        }
    }
}

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 WebApplication1
{
    public partial class displaypage : System.Web.UI.Page
    {
        SqlConnection conn = new SqlConnection(@"Data Source=SRAVI-PC\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=True");
        protected void Page_Load(object sender, EventArgs e)
        {
            getdata();
        }
        public void getdata()
        {
            string cmd = "select * from namestb";
            SqlDataAdapter da = new SqlDataAdapter(cmd, conn);
            DataSet ds = new DataSet();
            da.Fill(ds);
            GridView1.DataSource = ds.Tables[0];
            GridView1.DataBind();
        }

        protected void edit(object sender,CommandEventArgs z)
        {
            if (z.CommandName == "edit")
            {
                int id = Convert.ToInt32(z.CommandArgument);
                SqlDataAdapter da = new SqlDataAdapter("select * from namestb where Id=" + id, conn);
                DataSet ds = new DataSet();
                da.Fill(ds, "namestb");
                DataTable dt = new DataTable();
                dt = ds.Tables[0];
                int Id = Convert.ToInt16(dt.Rows[0]["Id"]);
                string FirstName = Convert.ToString(dt.Rows[0]["FirstName"]);
                string LastName = Convert.ToString(dt.Rows[0]["LastName"]);
                Response.Redirect("editpage.aspx?Id=" + Id + "&FirstName=" + FirstName + "&LastName=" + LastName);

            }
        }
    }
}