public string getContentShelf(string idMTL)
        {
            List <FPT_EDU_GET_SHELF_CONTENT_Result> listContentResult = db.FPT_EDU_GET_SHELF_CONTENT(idMTL).ToList();
            string contentOutput = "";
            string fieldCode     = "";
            string field020      = "";
            string field022      = "";
            string field100      = "";
            string field110      = "";
            string field245      = "";
            string field250      = "";
            string field260      = "";
            string field300      = "";
            string field490      = "";
            string field520      = "";

            foreach (FPT_EDU_GET_SHELF_CONTENT_Result item in listContentResult)
            {
                fieldCode = item.FieldCode;
                if (fieldCode.Equals("020"))
                {
                    field020 = ". -" + shelfBusiness.GetContent(item.Content);
                }
                if (fieldCode.Equals("022"))
                {
                    field022 = "=" + shelfBusiness.GetContent(item.Content);
                }
                if (fieldCode.Equals("100"))
                {
                    field100 = shelfBusiness.GetContent(item.Content);
                }
                if (fieldCode.Equals("110"))
                {
                    field110 = shelfBusiness.GetContent(item.Content);
                }
                if (fieldCode.Equals("245"))
                {
                    field245 = item.Content;
                    if (field245.Contains("$a"))
                    {
                        field245 = field245.Replace("$a", ". -");
                    }
                    if (field245.Contains("$b"))
                    {
                        field245 = field245.Replace("$b", " ");
                    }
                    if (field245.Contains("$c"))
                    {
                        field245 = field245.Replace("$c", " ");
                    }
                    if (field245.Contains("$n"))
                    {
                        field245 = field245.Replace("$n", " ");
                    }
                    if (field245.Contains("$p"))
                    {
                        field245 = field245.Replace("$p", " ");
                    }
                }
                if (fieldCode.Equals("250"))
                {
                    field250 = ". -" + shelfBusiness.GetContent(item.Content);
                }
                if (fieldCode.Equals("260"))
                {
                    field260 = item.Content;
                    if (field260.Contains("$a"))
                    {
                        field260 = field260.Replace("$a", ". -");
                    }
                    if (field260.Contains("$b"))
                    {
                        field260 = field260.Replace("$b", " ");
                    }
                    if (field260.Contains("$c"))
                    {
                        field260 = field260.Replace("$c", " ");
                    }
                }
                if (fieldCode.Equals("300"))
                {
                    field300 = item.Content;
                    if (field300.Contains("$a"))
                    {
                        field300 = field300.Replace("$a", ". -");
                    }
                    if (field300.Contains("$b"))
                    {
                        field300 = field300.Replace("$b", " ");
                    }
                    if (field300.Contains("$c"))
                    {
                        field300 = field300.Replace("$c", " ");
                    }
                    if (field300.Contains("$e"))
                    {
                        field300 = field300.Replace("$e", " ");
                    }
                }
                if (fieldCode.Equals("490"))
                {
                    field490 = ". -" + shelfBusiness.GetContent(item.Content);
                }
                if (fieldCode.Equals("520"))
                {
                    field520 = shelfBusiness.GetContent(item.Content);
                }
                contentOutput = field022 + field100 + field110 + "@" + field245 + "@" + field250 + field260 + field300 + field490 + "@" + field520 + field020;
            }
            return(contentOutput);
        }