How to show selected record from grid view to another page?

<asp:GridView ID="GridView1" runat="server" DataKeyNames="eno" AutoGenerateColumns="false" onpageindexchanging="GridView1_PageIndexChanging" PageSize="5" 
            AllowPaging="true" onrowcommand="GridView1_RowCommand"> 
            <Columns>            
            <asp:BoundField DataField="eno" HeaderText="Employee No." />               
            
            <asp:BoundField DataField="empname" HeaderText="Employee Name" />    
            <asp:BoundField DataField="sal" HeaderText="Salary" />

            <asp:TemplateField HeaderText="Details">
                <ItemTemplate>
                       <asp:ImageButton ID="Image1" runat="Server" CommandName="cmdBind" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>"  runat="server" CausesValidation="false" ImageUrl="~/images/p1.png" />
                </ItemTemplate>
            </asp:TemplateField>           
            </Columns>
</asp:GridView>             

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
        if (e.CommandName == "cmdBind")
        {
            LinkButton lb = (LinkButton)e.CommandSource;
            int index = Convert.ToInt32(lb.CommandArgument);
             string pkey;         
            //Bind values in the text box of the pop up control
            pkey = GridView1.Rows[index].Cells[0].Text;
            Response.Redirect("Page2.aspx?eno="  + pkey + ");             //here i have transfer primary key second page taken that query string in second page and get data for that particular record and update it       
        }
}    

using System.Data;
using System.Data.SqlClient;

public partial class GridHypher : System.Web.UI.Page
{
    SqlConnection sqlcon = new SqlConnection(@"Server=SQLEXPRESS;database=test;uid=xxxx;pwd=yyyy;");
    SqlCommand sqlcmd;
    SqlDataAdapter da;
    DataTable dt = new DataTable();
    DataTable dt1 = new DataTable();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
           string eno;
           eno = Request.QueryString["eno"];
           sqlcon.Open();
           sqlcmd = new SqlCommand("select * from emp where eno='" + eno + "'", sqlcon);
           da = new SqlDataAdapter(sqlcmd);
           da.Fill(dt);
           if (dt.Rows.Count > 0)
           { 
            txteno.Text=dt.Rows[0]["eno"].ToString();
            txtempname.Text=dt.Rows[0]["empname"].ToString();
            txtsal.Text=dt.Rows[0]["sal"].ToString();
           }
        }

    }

}