private Uri MediaFilesApi(string surveyId, string fileName)
{
var uriText = new StringBuilder(ConnectionClient.NfieldServerUri.AbsoluteUri);
uriText.AppendFormat("Surveys/{0}/MediaFiles/", surveyId);
if (!string.IsNullOrEmpty(fileName))
{
uriText.AppendFormat("?fileName={0}", HttpUtility.UrlEncode(fileName));
}
return new Uri(uriText.ToString());
}