Nested GridView [No JavaScripts]

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Data.Sql;
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;

public partial class order_view : System.Web.UI.Page
{
    SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["IVN_sysConnectionString"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        LinkButton l_btn = (LinkButton)sender;
        GridViewRow gvr = (GridViewRow)l_btn.NamingContainer;
        Panel p1 = (Panel)gvr.FindControl("Panel1");
        LinkButton lb1 = (LinkButton)gvr.FindControl("LinkButton1");
        if (p1.Visible == false)
        {
            p1.Visible = true;
            lb1.Text = "-";
        }
        else if (p1.Visible == true)
        {
            p1.Visible = false;
            lb1.Text = "+";
        }
        GridView gv2 = (GridView)l_btn.FindControl("GridView2");
        gv2.DataBind();
    }

    protected void GridView2_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            SqlDataSource s = (SqlDataSource)e.Row.FindControl("SqlDataSource2");
            s.SelectParameters[0].DefaultValue = e.Row.Cells[1].Text;
        }
        DataSet dss = new DataSet();
        SqlDataAdapter daa = new SqlDataAdapter("SELECT order_status_overall FROM orders WHERE order_no='" + e.Row.Cells[1].Text + "';", conn);
        daa.Fill(dss);
        string x = "Not Received";
        int y=0;
        //foreach(DataRow drr in dss.Tables[0].Rows)
            foreach(DataRow drr in dss.Tables[0].Rows)
             {
            y=string.Compare(drr[0].ToString(),x.ToString());
            if(y==0)
            {
                e.Row.BackColor = System.Drawing.Color.LightPink;
            }
        }
    }
    protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {

    }
}