public Task RemoveAsync(string surveyId, string fileName)
{
if (string.IsNullOrEmpty(surveyId))
{
throw new ArgumentNullException("surveyId");
}
if (string.IsNullOrEmpty(fileName))
{
throw new ArgumentNullException("fileName");
}
return
Client.DeleteAsync(MediaFilesApi(surveyId, fileName).AbsoluteUri)
.FlattenExceptions();
}