private void btnAck_Click(object sender, System.EventArgs e)
            ediDocument oEdiDoc = null;
            ediDataSegment oSegment = null;
            ediAcknowledgment oAck = null;
            ediSchemas oSchemas = null;

            string sSegmentID;
            string sLoopSection;
            int nArea;

            string sPath = AppDomain.CurrentDomain.BaseDirectory;

            //edi file to be acknowledged
            string sEdiFile = "837.X12";

            Cursor = Cursors.WaitCursor;

            ediDocument.Set(ref oEdiDoc, new ediDocument());    // oEdiDoc = new ediDocument();

            //By default, FREDI uses the  universal coordinated time (UTC), however you can change it to local time

            // Disabling the internal standard reference library to makes sure that 
            // FREDI uses only the SEF file provided
            ediSchemas.Set(ref oSchemas,(ediSchemas) oEdiDoc.GetSchemas());    //oSchemas = (ediSchemas) oEdiDoc.GetSchemas();
            oSchemas.EnableStandardReference = false;

            // This makes certain that the EDI file must use the same version SEF file, otherwise
            // the process will stop.

            // By setting the cursor type to ForwardOnly, FREDI does not load the entire file into memory, which
            // improves performance when processing larger EDI files.
            oEdiDoc.CursorType = DocumentCursorTypeConstants.Cursor_ForwardOnly;

            // If an acknowledgment file has to be generated, an acknowledgment object must be created, and its 
            // property must be enabled before loading the EDI file.
            oAck = (ediAcknowledgment) oEdiDoc.GetAcknowledgment();
            oAck.EnableFunctionalAcknowledgment = true;

            //Property to enable TA1 acknowledgment in the 997
            oAck.EnableInterchangeAcknowledgment = true;
            //Option to combine the TA1 and 997 into one Interchange

            // Set the starting point of the control numbers in the acknowledgment

            // Error codes that are not automatically mapped to an acknowlegment error number by FREDI can be set by
            // using the MapDataElementLevelError method.
            oAck.MapDataElementLevelError(13209, 5,"","","","");

            // All SEF files required for processing the EDI files must be provided by calling the LoadSchema.  
            // The "LoadSchema" method does not actually load the SEF files at this time, but are actually 
            // loaded during the LoadEdi method.
            oEdiDoc.LoadSchema(sPath + "837_X098.SEF", 0);    //for EDI (837) file
            oEdiDoc.LoadSchema(sPath + "997_X12-4010.SEF", 0);    //for Ack (997) file

            // Loads EDI file and the corresponding SEF file
            oEdiDoc.LoadEdi(sPath + sEdiFile);

            // Gets the first data segment in the EDI files
            ediDataSegment.Set(ref oSegment, (ediDataSegment) oEdiDoc.FirstDataSegment);  //oSegment = (ediDataSegment) oEdiDoc.FirstDataSegment

            // This loop iterates though the EDI file a segment at a time
            while ( oSegment != null ) 
                // A segment is identified by its Area number, Loop section and segment id.
                sSegmentID = oSegment.ID;
                sLoopSection = oSegment.LoopSection;
                nArea = oSegment.Area;

                //get next data segment
                ediDataSegment.Set(ref oSegment, (ediDataSegment) oSegment.Next());    //oSegment = (ediDataSegment) oSegment.Next();

            // Checks the 997 acknowledgment file just created.
            // The 997 file is an EDI file, so the logic to read the 997 Functional Acknowledgemnt file is similar
            // to translating any other EDI file.

            // Gets the first segment of the 997 acknowledgment file
            ediDataSegment.Set(ref oSegment, (ediDataSegment) oAck.GetFirst997DataSegment());    //oSegment = (ediDataSegment) oAck.GetFirst997DataSegment();

            while ( oSegment != null ) 
                nArea = oSegment.Area;
                sLoopSection = oSegment.LoopSection;
                sSegmentID = oSegment.ID;

                if (nArea == 1)
                    if (sLoopSection == "")
                        if (sSegmentID == "AK9")
                            if (oSegment.get_DataElementValue(1,0) == "R")
                                // reject EDI file
                    }    // sLoopSection == ""
                }    //nArea == 1

                ediDataSegment.Set(ref oSegment, (ediDataSegment) oSegment.Next());    //oSegment = (ediDataSegment) oSegment.Next();
            }    //oSegment != null

            //save the acknowledgment
            oAck.Save(sPath + "997_" + sEdiFile);

            Cursor = Cursors.Default;

            MessageBox.Show("Done. Output = " + sPath + "997_" + sEdiFile);

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