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#? Continue reading...