I deal with it too.
GoogleAdsServiceClient googleAdsService = client.GetService( Services.V10.GoogleAdsService);
string query = "SELECT
conversion_action.id,
conversion_action.name, conversion_action.type, conversion_action.status, conversion_action.resource_name, conversion_action.app_id " +
" FROM conversion_action WHERE
conversion_action.name = 'OfflineSales'";
SearchGoogleAdsRequest request = new SearchGoogleAdsRequest()
{
CustomerId = customerId.ToString(),
Query = query
};
GoogleAdsRow googleAdsRow = googleAdsService.Search(request).First();