session.Logon("TVServer",
      "AdminUser",
      "AdminPass",
      0,
      TVApplicationType.tvApplicationTypeAdministrator,
      34202,
      TVServerConnectionLevel.tvServerConnectionLevelFull,
      false,
      TVStationUsage.tvStationUsageOwner);

bool station_found = false;
Folder f = session.GetDefaultFolder(TVDefaultFolders.tvFolderUsers);
TeleVantage.User u = f.Items.Item("John Galt", TVSearchType.tvSearchKey);

foreach (Address a in u.Addresses)
{
  if (a.AddressType == TVAddressType.tvAddressTypeStation)
  {
    a.Value = new_station;
    u.Save();
    station_found = true;
    break;
  }
}

if (!station_found)
{
  Address a = u.Addresses.Add();
  a.AddressType = TVAddressType.tvAddressTypeStation;
  a.Category = TVAddressCategory.tvAddressCategoryNone;
  a.Description = "Default Station";
  a.Value = new_station;
  a.Default = true;
  u.Save();
}