protected void gv_assignments_RowDeleting( object sender, GridViewDeleteEventArgs e )
        {
            defaultStatus();
            BusinessTier.Admin admin = new BusinessTier.Admin();

            int assign_id = int.Parse(this.gv_assignments.Rows[e.RowIndex].Cells[2].Text);
            string pid = this.gv_assignments.Rows[e.RowIndex].Cells[3].Text;
            if ( admin.SearchPatientByID(pid).Rows.Count > 0 )
            {
                Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "deleteError()", true);
            }
            else
            {
                admin.DeleteAssignmentByID(assign_id);
            }
        }