You can try another way to
read EAN13 barcode in .NET library.
Just copy the following C# to your project, and make sure where the ean13 you need to decode locates.
BusinessRefinery.Barcode.Linear barcode = new Linear();
barcode.Symbology = Symbology.EAN13;
barcode.Code = "000123456789";
Bitmap bmp = barcode.drawBarcodeOnBitmap();
barcode.drawBarcode2ImageFile("c://aaa.png");
//string[] barcodes = BarCodeReader.scanBarCode(bmp, BusinessRefinery.Barcodes.Reader.BarCodeType.EAN13);
string[] barcodes = BarCodeReader.scanBarCode("c://qr.jpg", BusinessRefinery.Barcodes.Reader.BarCodeType.EAN13);