public static bool IsNew(long code) 
        {
            int result = 0;

                result = (from adCount in data.AdCode
                          where adCount.Code == code
                          select adCount).Count();
            if (result > 0) return false; else return true;

        }

{SELECT 
[Extent1].[Id] AS [Id], 
[Extent1].[code] AS [code], 
[Extent1].[LinkId] AS [LinkId]
FROM [AdCode] AS [Extent1]
WHERE [Extent1].[code] = @p__linq__0}

public static void  InsertLink(string link)
        {
            long id=0;
           
             DataLink avLink = new DataLink { Link = link, Used = false };
            data.DataLink.Add(avLink);
            data.SaveChanges();
            id=  avLink.Id; 
            string idStr = Regex.Match(link, "\\d+$").Value;
            long code = Convert.ToInt64(idStr);
            InsertCode(id, code);
        }
		
		 private static void InsertCode(long code,long linkId)
        {
                AdCode codeObj = new AdCode { Code = code };
                data.AdCode.Add(codeObj);
                data.SaveChanges(); 
        }