<?xml version="1.0" encoding="utf-16"?>. use different encoding

public string Serialize<T>(T serializeClass)
        {
            string xmlString = string.Empty;
            try
            {
                if (serializeClass != null)
                {
                    XmlSerializer serializer = new XmlSerializer(typeof(T));
                    StringBuilder xmlStringBuilder = new StringBuilder();
                    XmlWriterSettings setting = new XmlWriterSettings() { Encoding = Encoding.UTF8};

                    using (XmlWriter writer = XmlWriter.Create(xmlStringBuilder, setting))
                    {
                        serializer.Serialize(writer, serializeClass);
                        xmlString = xmlStringBuilder.ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                xmlString = string.Empty;
            }
            return xmlString;
        }