public void UpdateField(string unid, string fieldName, string fieldValue)
{
var field = HttpUtility.UrlEncode(fieldName);
var value = fieldValue != null ? HttpUtility.UrlEncode(fieldValue, Encoding.GetEncoding("iso-8859-1")) : string.Empty;
var dataUpdatePath = string.Format(_updatePathPattern, unid, field, value);
SendRequest(dataUpdatePath);
}