I have the following code (excerpt):
<code>    public struct UserAddress
   {
       public int ID;
       public string companyName;
       public string address;
       public string city;
       public string zip;
   }
   ...
       [WebMethod]
       public List<UserAddress> GetAddresses(int UserID)
       {
           DbCommand cmd;
           DbParameter param;
           DbDataReader reader;
           int Idx;
           ...
        }</code>
If I have no data, for example for the field "companyName", I want to
return a NULL value (probably by omitting the value node from the
response xml). However, all my attempts to get there, always simply
return an empty node, e.g.: <companyName />.

Is there any way to accomplish this, we need to be able to differ
between empty strings and null values in the database.

Thanks,
Daniel