public SubContent Save(SubContent content)
 {
     using (var db = new CEEntities())
     {
         var existContent = GetSubContent(content.Id);
         if (existContent == null)
         {
             db.SubContent.Add(content);
         }
         else
         {
             content.Id = existContent.Id;
             existContent = content;
         }
         db.SaveChanges();
         return GetSubContent(content.Id);
     }
 }
 public SubContent SaveSubContent(SubContent subContent)
 {
     return Save(subContent, subContentData.Save);
 }