[Solved] set response encoding from XML

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Try setting the encoding to the encoding from the code page 1252. The example below uses a simple service to serve the file, and setting the encoding to UTF-8 shows the same problem you have; setting it to the correct encoding works.

public class StackOverflow_7044842
{
    const string xml = @"<ajax-response>
<response>
<item>
<number></number>
<xxx>Não ok</xxx>
<error>null</error>
</item>
</response>
</ajax-response>";

    [ServiceContract]
    public class SimpleService
    {
        [WebGet]
        public Stream GetXml()
        {
            WebOperationContext.Current.OutgoingResponse.ContentType = "text/xml";
            Encoding encoding = Encoding.GetEncoding(1252);
            return new MemoryStream(encoding.GetBytes(xml));
        }
    }
    public static void Test()
    {
        string baseAddress = "http://" + Environment.MachineName + ":8000/Service";
        WebServiceHost host = new WebServiceHost(typeof(SimpleService), new Uri(baseAddress));
        host.Open();
        Console.WriteLine("Host opened");

        WebClient client = new WebClient();
        client.Encoding = Encoding.GetEncoding(1252);
        string response = client.DownloadString(baseAddress + "/GetXml");
        Console.WriteLine(response);

        Console.Write("Press ENTER to close the host");
        Console.ReadLine();
        host.Close();
    }
}

solved set response encoding from XML