Show Hide Grid Content using Server side(.Net) and Client side(JQuery)

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;

public partial class GridviewNestedContorls_Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            load_gridviewrecords();
        }
    }
    private void load_gridviewrecords()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("jobid");
        dt.Columns.Add("jobtitle");
        dt.Columns.Add("positions");
        dt.Columns.Add("Description");
        DataRow dr1 = dt.NewRow();
        dr1["jobid"] = "JOB122";
        dr1["jobtitle"] = "Software Engineer";
        dr1["positions"] = "10";
        dr1["Description"] = "This job not direct. You have to apply through online. Qualification required BE (Computer Science), M.Tech(Computer Science), MCA. Year of passout 2011, 2012.";
        dt.Rows.Add(dr1);
        DataRow dr2 = dt.NewRow();
        dr2["jobid"] = "JOB123";
        dr2["jobtitle"] = "Associate System Engineer";
        dr2["positions"] = "100";
        dr2["Description"] = "This job not direct. You have to apply through online. Basic knowledge of web development. Qualification required BE (Computer Science), M.Tech(Computer Science), MCA. Year of passout 2011, 2012.";
        dt.Rows.Add(dr2);
        DataRow dr3 = dt.NewRow();
        dr3["jobid"] = "JOB124";
        dr3["jobtitle"] = "Web designer";
        dr3["positions"] = "5";
        dr3["Description"] = "This job not direct. You have to apply through online. Required skills css, Jquery, Html, Photoshop. Qualification required BE (Computer Science), M.Tech(Computer Science), MCA. Year of passout 2011, 2012.";
        dt.Rows.Add(dr3);
        dt.AcceptChanges();
        GridView1.DataSource = dt;
        GridView1.DataBind();
        
    }
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName == "showhide")
        {
            int index = int.Parse(e.CommandArgument.ToString());
            GridViewRow gr = GridView1.Rows[index];
            ImageButton imgbtn = (ImageButton)gr.FindControl("ImageButton1");
            Panel pnl = (Panel)gr.FindControl("pnlOrders");
            if (pnl.Visible == false)
            {
                imgbtn.ImageUrl = "minus.jpg";
                pnl.Visible = true;
            }
            else
            {
                imgbtn.ImageUrl = "plus.jpg";
                pnl.Visible = false;
            }
        }
    }
}