Converting Progress 4GL blob file to pdf in c#

I've got a simple webservice developed in Progress 4GL from which I receive as output parameter a dataset with a blob in whoich I have stored a pdf file.

DEFINE TEMP-TABLE TTDocument NO-UNDO
FIELD DocSeqNr AS INT
FIELD FileName AS CHAR
FIELD EventCode AS CHAR
FIELD EventDescr AS CHAR
FIELD FileContent AS BLOB
.


DEFINE DATASET ds FOR TTDocument.

DEFINE INPUT PARAMETER pCoCd AS CHARACTER NO-UNDO.
DEFINE INPUT PARAMETER pLanCd AS CHARACTER NO-UNDO.
DEFINE INPUT PARAMETER pUsrCd AS CHARACTER NO-UNDO.
DEFINE INPUT PARAMETER pFilter AS CHARACTER NO-UNDO.
DEFINE OUTPUT PARAMETER DATASET FOR ds.
DEFINE OUTPUT PARAMETER pErrorTxt AS CHARACTER NO-UNDO.


In .Net I make a request to this web service and I handle the response like this :

XmlElement doc;
DataSet xxx = new DataSet();
beaHostDB.GetDocumets(pCoCd, lanCd, pUsrCd,idAdd, out doc, out pErrorTxt);
XmlElementToXmlDocment(doc);
var reader = new StringReader(doc.InnerXml);
xxx.ReadXml(reader);
foreach (DataRow dr in xxx.Tables[0].Rows)
{
DcumentList.Add(new Document { FileContent =dr["FileContent"].ToString});
}


So now I have a string with the binary representation of this pdf file.

How can I convert this string to bytes[] to get this pdf file in c#?

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