:: BarCode Scanner and specify hidden field ::

You can use the BarcodeEngine to parse the barcode. You can then use the BarcodeData returned by either setting the values or getting the data to populate fields.

BarcodeEngine barcodeEngineInstance = new BarcodeEngine(); 
BarcodeData[] dataArray = barcodeEngineInstance.Reader.ReadBarcodes(image, LeadRect.Empty, 0, null); //read barcode

for (int i = 0; i < dataArray.Length; i++) 
{ 
                BarcodeData data = dataArray[i]; 
                Console.WriteLine("Data: {0}", data.Value); //get and set string data
}

https://www.leadtools.com/help/sdk/tutorials/dotnet-console-detect-and-extract-barcodes.html
https://www.leadtools.com/help/sdk/v22/dh/ba/barcodedata-value.html