How to create new Issue(IssueEN[]) with attachements, How I do it?

My source:

           IssueEN issue = new IssueEN();
                   .........................................................
                   var postedFile = Request.Files[0];
                   var sFileName = postedFile.FileName;
                               
                    byte[] buf = new byte[postedFile.InputStream.Length];
                    postedFile.InputStream.Read(buf, 0, buf.Length);
                   
                    FileEN[] fileUpload = new FileEN[1];
                    fileUpload[0] = new FileEN();                  
                    fileUpload[0].FileName = sFileName;
                    fileUpload[0].ProjectID = issue.ProjectID;
                    fileUpload[0].FileData = buf;                                 
                    issue.Attachments = fileUpload;
        
             _proxy.CreateIssue(issue);

Thank you,
June