public void Add(ContactDbRow c)
 {
     lock (lockObj)
     {
         using (var conn = GetConn())
         {
             conn.Insert(c);
         }
     }
 }
 public void Delete(ContactDbRow c)
 {
     lock (lockObj)
     {
         using (var conn = GetConn())
         {
             conn.Delete(c);
         }
     }
 }