Bind Dropdown on Footer templete

protected void grdRequestHandling_RowDataBound(object sender, GridViewRowEventArgs e)

        {

            try

            {

                if (e.Row.RowType == DataControlRowType.Footer)

                {

                    DropDownList dropdown = e.Row.FindControl("ddlAddRole") as DropDownList;

                    dropdown.DataSource = objBL.GetRoles();

                    dropdown.DataTextField = "RoleName";

                    dropdown.DataValueField = "RoleId";

                    dropdown.DataBind();

                }

            }

            catch (Exception)

            {

               

            }

        }

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