send object as parameters into multipart-form - restsharp

Question

I want to send and object ( application/xml ) into multipart-form.
This is the capture of request in java what goes right:
POST /OpenKM/services/rest/document/create HTTP/1.1
Accept: application/xml
Content-Type: multipart/form-data; boundary=Boundary_1_1316797734_1423153602196
Authorization: Basic b2ttQWRtaW46YWRtaW4=
MIME-Version: 1.0
User-Agent: Java/1.7.0_60
Host: localhost:8180
Connection: keep-alive
Transfer-Encoding: chunked
74
--Boundary_1_1316797734_1423153602196
**Content-Type: application/xml
Content-Disposition: form-data; name="doc"**
20c
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><document><path>/okm:root/myDoc.doc</path><permissions>0</permissions><subscribed>false</subscribed><checkedOut>false</checkedOut><convertibleToDxf>false</convertibleToDxf><convertibleToPdf>false</convertibleToPdf><convertibleToSwf>false</convertibleToSwf><description></description><locked>false</locked><signed>false</signed></document>
--Boundary_1_1316797734_1423153602196
Content-Type: application/octet-stream
Content-Disposition: form-data; name="content"
This is what I get from .net
POST /OpenKM/services/rest/document/create HTTP/1.1
Authorization: Basic b2ttQWRtaW46YWRtaW4=
Accept: application/xml
User-Agent: RestSharp/104.4.0.0
Host: localhost:8180
Content-Type: multipart/form-data; boundary=-----------------------------28947758029299
Content-Length: 24353
Accept-Encoding: gzip, deflate
Connection: Keep-Alive
-------------------------------28947758029299
**Content-Disposition: form-data; name="doc"**
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><document>
<lastModified>01/01/0001 0:00:00</lastModified>
<locked>false</locked>
<checkedOut>false</checkedOut>
<signed>false</signed>
<convertibleToPdf>false</convertibleToPdf>
<convertibleToSwf>false</convertibleToSwf>
<convertibleToDxf>false</convertibleToDxf>
<created>01/01/0001 0:00:00</created>
<path>/okm:root/myDoc.doc</path>
<permissions>0</permissions>
<subscribed>false</subscribed>
</document>
-------------------------------28947758029299
Content-Disposition: form-data; name="content"; filename="myDoc.doc"
Content-Type: application/octet-stream
;
Seems the differences is I'm not indicating that the content is application/xml ( Content-Type: application/xml ? )
This is my code, any suggestion is wellcome
IRestRequest request = new RestRequest(uriHelper.DOCUMENT_CREATE, Method.POST);
request.RequestFormat = DataFormat.Xml;
Document testdoc = new Document();
testdoc.path = "/okm:root/myDoc.doc";
string doc = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" + request.XmlSerializer.Serialize (testdoc).Replace("<Document>", "<document>").Replace("</Document>", "</document>");
request.AddParameter("doc", doc);
byte[] bytes = beanHelper.ReadToEnd(fileStream);
String fileName = Path.GetFileName(docPath);
request.AddFile("content", bytes, fileName);
RestClient client = getClient(url, user, password);
IRestResponse<Document> response = client.Execute<Document>(request);