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DataContractJsonSerializerSettings st = new DataContractJsonSerializerSettings();
if (!string.IsNullOrEmpty(dateFormat)) st.DateTimeFormat = new System.Runtime.Serialization.DateTimeFormat(dateFormat);
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T), st);
MemoryStream ms = new MemoryStream();
ser.WriteObject(ms, t);
string jsonString = Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
return jsonString;