public string GetBarcodeFromFile(string codeType, string filename)
{
BarcodeFormat format = CodeReader.FormatFromString(codeType);
CodeReader Reader = new CodeReader(format);
Bitmap barcodeBitmap = (Bitmap)Image.FromFile(filename, true);
Result result = Reader.ReadCode(barcodeBitmap);
barcodeBitmap.Dispose();
return(result.ToString());
}