link button attribute add doubt.[gridview refresh]

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ASP.NET

i have two pages.

1)1st page where a link button is there...that navigates to next page
2)once i click on link button on first page...navigate to second page[its actually a modal pop up type a separte window]. I insert records in this page in 2nd page in the grid. When i close this window,,,, and again i click on link button on first page,,,i find no records there in the grid,,,
but when i run again my code the data is there,,,,

the first page code:

protected void gridShuttleAdmin_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            //onmouse over and mouse out on the grid color changes
            e.Row.Attributes.Add("onmouseover", "this.previous_color=this.style.backgroundColor;this.style.backgroundColor='PaleGreen'");
            e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=this.previous_color;");

            Label lbltrip = (Label)e.Row.FindControl("lbltrip");
            if (lbltrip != null)
            {
                Label lblshuttledetailname = (Label)e.Row.FindControl("lblshuttledetailname");
                Label lblshuttlefacilityid = (Label)e.Row.FindControl("lblshuttlefacilityid");
                Label lblfacilityid = (Label)e.Row.FindControl("lblfacilityid");
                LinkButton lbtn = (LinkButton)e.Row.FindControl("lnkviewID");
                lbtn.Attributes.Add("onClick", "var sFeatures='dialogHeight: 700px;dialogWidth: 1000px;'; window.showModalDialog('Shuttle_StopDetails.aspx?shuttlefacilityid=" + lblshuttlefacilityid.Text + "&facility =" + lblfacilityid.Text + "&Trip = " + lbltrip.Text + "','',sFeatures);window.document.forms[0].submit();");
                 
               
            }
        }      
    }

/* lbtn.Attributes.Add("onClick", "var sFeatures='dialogHeight: 700px;dialogWidth: 1000px;'; window.showModalDialog('Shuttle_StopDetails.aspx?shuttlefacilityid=" + lblshuttlefacilityid.Text + "&facility =" + lblfacilityid.Text + "&Trip = " + lbltrip.Text + "','',sFeatures);window.document.forms[0].submit();");


here i m navigating to next page passing the parameters as query string
*/

/*lot of doubts are there....one more doubt over here is ('Shuttle_StopDetails.aspx?shuttlefacilityid=" + lblshuttlefacilityid.Text + "&facility =" + lblfacilityid.Text + "&Trip = " + lbltrip.Text + "','',sFeatures);window.document.forms[0].submit();");

here only the first parameter i am able to fetch,,,,in the next page,,,i m unable to fetch the other two parameters,,,am i doing anything wrong

trip_num = Request.QueryString["Trip"]; //here i am getting null

shuttlefacility_id = Request.QueryString["shuttlefacilityid"];//here i am able to fetch the data
*/