After binding my session variables at set to 0

Once the code is binds to the grid.  I lose my session variables which makes updating an issue.

Can someone tell me how to keep my session variable for the update part of the LINQ query?

public void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        LabelAcknMessage.Text = string.Empty;
        GridView1.EditIndex = e.NewEditIndex;
        // Get table and row for editing with index selected... This is when you click edit.
        string strJobTitleName = (GridView1.Rows[e.NewEditIndex].FindControl("lblJobTitle") as Label).Text;
        if (strJobTitleName != null)
        {
            HCGASF_MaintDataContext db = new HCGASF_MaintDataContext();
            var JobTitle = (from jt in db.JobTitles
                                where jt.JobTitleName == strJobTitleName
                            select jt).SingleOrDefault();
            Session["OLD_JobTitleID"] = JobTitle.JobTitleID;
            // test string make sure it is in the right number.
            string strTitle = Session["OLD_JobTitleID"].ToString();
            intTitle = Convert.ToInt32(strTitle);
        }

        string strHCApplicationName = (GridView1.Rows[e.NewEditIndex].FindControl("lblHCApplication") as Label).Text;
        if (strHCApplicationName != null)
        {
            HCGASF_MaintDataContext db = new HCGASF_MaintDataContext();
            var HCApp = (from ap in db.HomeCareSoftwareLists
                         where ap.HCApplication == strHCApplicationName
                            select ap).SingleOrDefault();
            Session["OLD_HCApplicationID"] = HCApp.HCSoftwareID;
            // test string make sure it is in the right number.
           string strHC = Session["OLD_HCApplicationID"].ToString();
           intHC = Convert.ToInt32(strHC);
        }



        BindData();
    }