Web Service response from XMLA (using BW SAP) returns french Accent characters as question marks '?'

Question

I am using .Net Framework 4 C# web service project. 
I am connecting with XMLA service (using as web reference) in my C# project. The issue seems to be able to handle the French characters once i am getting response back from the XMLA execute method. 
At this moment the data is coming back as '??' whenever it contains french special characters.
I am pasting the code below and would appreciate help at earliest. 
sapqasbwi.MsXmlAnalysis _sMxlA = new sapqasbwi.MsXmlAnalysis();   // Create XMLA reference object. 
System.Net.NetworkCredential _nc = new System.Net.NetworkCredential();  // Creating Network credentials object
_nc.UserName = userid;
_nc.Password = _password;
_sMxlA.Credentials = _nc.GetCredential(new System.Uri(url), "Basic");
_sMxlA.Url = url;
sapqasbwi.ExecuteCommand cmd = new sapqasbwi.ExecuteCommand();
cmd.Statement = stText;    // sText contains the query 
_bwPropertyList.DataSourceInfo = "default";
_bwPropertyList.Format = "Tabular";
_bwPropertyList.AxisFormat = "ClusterFormat"; 
_bwPropertyList.Content = "SchemaData"; 
_bwParameters.PropertyList = _bwPropertyList;
_sMxlA.RequestEncoding = System.Text.Encoding.GetEncoding("ISO-8859-1");  // already tried utf 8 
//Execute BW Query
System.Xml.XmlElement returnXML;
returnXML = _sMxlA.Execute(cmd, _bwParameters); // Execute method only returns an XML element object. 
This particular object is containing the '??' whenever a french character is found
The output i am receiving is as follows 
<MainServiceAndStatuses>
   <MainService>Entreposage ?? long terme</MainService> 
 <MainServiceStatus>Service Termin??</MainServiceStatus> 
 <TransactionID>1000006216_10_Cde client standard</TransactionID> 
</MainServiceAndStatuses

Answer 1

Hi 
Can you please send me the direct link for C# forum, i cannot find it on this forum. 
thank 
TheNauman