EditarUsuarios.CargarRolesdelSistema C# (CSharp) Method

    protected void CargarRolesdelSistema()
    {
        try
        {
            lb_sourcerols.Items.Clear();
            lb_sourcerols.DataSource = USER.RetrieveRol();
            lb_sourcerols.DataBind();
        }
        catch (Exception er)
        {
            Session["Error_Msg"] = er.Message;
            Response.Redirect("~/Error.aspx", true);
        }
    }