How to read, scan QR Code in C# ASP.NET, MVC web app?

string[] datas = BarcodeScanner.Scan("qrcode-sample.png", BarcodeType.QRCode);

BarcodeDetail[] datasInDetail = BarcodeScanner.ScanInDetails(
    "qrcode-sample.png", BarcodeType.QRCode);

byte[] dataBytes = File.ReadAllBytes("sample-barcode.png");

Stream barcodeInStream = new MemoryStream(dataBytes);

string[] datas = BarcodeScanner.Scan(barcodeInStream, BarcodeType.QRCode);

BarcodeDetail[] datasInDetail = BarcodeScanner.ScanInDetails(
     barcodeInStream, BarcodeType.QRCode);

BarcodeDetail[] datas = BarcodeScanner.ScanInDetails("multiple-barcodes.png",
    new List<BarcodeType> { BarcodeType.QRCode, BarcodeType.Code128 });

BarcodeDetail[] datasInDetail = BarcodeScanner.ScanInDetails(
    "qrcode-sample.png", BarcodeType.QRCode);

ScanOptions ops = new ScanOptions(BarcodeType.QRCode);
BarcodeDetail[] result = BarcodeScanner.Scan(imgFilePath, ops);
if (result != null && result.Length > 0)
{
    foreach (BarcodeDetail b in result)
    {
        Console.WriteLine("Message: {0}", b.GetMessage());
        if (b.Type == BarcodeType.QRCode)
        {
            QRCodeProps props = (QRCodeProps)b.GetBarcodeProps();
            //  Get version used in encoding.
            Console.WriteLine("Version:     {0}", props.Version.ToString());
            //  Get data mode used in encoding.
            //  QRCodeDataMode.Mix for more than 1 data modes used.
            Console.WriteLine("Data Mode:   {0}", props.DataMode.ToString());
            //  Get error correction level used in encoding.
            Console.WriteLine("ECL:         {0}", props.ECL.ToString());
            //  Indicate if it contains structure append block.
            Console.WriteLine("Is Structure Append: {0}", props.IsStructuredAppend);
            if (props.IsStructuredAppend)
            {
                //  Get symbol position. Start from 1.
                Console.WriteLine("Symbol Position:     {0}", props.SymbolPosition);
                //  Get number of symbols in the group.
                Console.WriteLine("Symbol Count:        {0}", props.SymbolCount);
                //  Get 8-bit parity data.
                Console.WriteLine("Parity:              {0}", props.Parity);
            }
        }
    }
}

String[] result = BarcodeScanner.Scan("C://Input//qrcode-ascii-sample.png", 
    BarcodeType.QRCode);

if (result.Length > 0) {
    foreach (String msg in result) {
        Debug.WriteLine("QR Code Raw Message: '" + msg + "'");
        String tmp = msg.Replace("\r", "[CR]");
        Debug.WriteLine("QR Code ASCII Text: '" + tmp + "'");
    }
}
else {
    Debug.WriteLine("No QR Code Scanned!");
}

BarcodeDetail[] datas = BarcodeScanner.ScanInDetails(
    "C://Input//qrcode-unicode.png", BarcodeType.QRCode);
            
for (int j = 0; j < datas.Length; j++) {
    string textMsgDecoded = System.Text.Encoding.UTF8.GetString(datas[j].GetDataBytes());
    Console.WriteLine("Unicode text: " + textMsgDecoded);
}

BarcodeDetail[] result = BarcodeScanner.ScanInDetails("C://Input//qrcode-gs1-data.png", 
    BarcodeType.QRCode);

foreach (BarcodeDetail b in result) {
    //  Indicate if the QR Code is conform to GS1 system.
    if (b.IsGS1Compitable) {
        //  Get message in string format.
        //  Eg. "(415)5412345678908(3911)710125"
        String msg = b.GetMessage();
        Console.WriteLine("Raw Data: '{0}'", b.Data);
        Console.WriteLine("Text Message: {0}", msg);
        //  Retrieve each AI and its data from the message.
        //  Eg.
        //  AI:   415
        //  Data: 5412345678908
        //  AI:   3911
        //  Data: 710125
        String[] vals = msg.Split(new char[] { '(', ')' }, 
            StringSplitOptions.RemoveEmptyEntries);
        for (int i = 0; i < vals.Length; i += 2) {
            Console.WriteLine("AI:    {0}", vals[i]);
            Console.WriteLine("Data:  {0}", vals[i + 1]);
         }
    }
}

string[] barcodes = BarcodeScanner.ScanSingleBarcode("qrcode-single-barcode.png", 
    BarcodeType.QRCode);

BarcodeDetail[] datas = BarcodeScanner.ScanInDetails("qrcode-multiple-formats.png",
    new List<BarcodeType> { BarcodeType.QRCode, BarcodeType.Code128 });

BarcodeDetail[] datasInDetail = BarcodeScanner.ScanInDetails("qrcode-all-formats.png", 
    BarcodeType.All);

List<SRegion> regions = new List<SRegion>();
regions.Add(new SRegion(0, 0, 50, 60));
regions.Add(new SRegion(100, 100, 50, 60));

string[] barcodes = BarcodeScanner.ScanRegions("qrcode-barcodes.png", 
    BarcodeType.QRCode, regions);

List<SRegion> regions = new List<SRegion>();
regions.Add(new SRegion(0, 0, 50, 60));
regions.Add(new SRegion(100, 100, 50, 60));

string[] barcodes = BarcodeScanner.ScanSingleBarcodeRegions("qrcode-barcodes.png", 
    BarcodeType.QRCode, regions);

ScanOptions ops = new ScanOptions(BarcodeType.QRCode);
ops.ScanDirection = ScanDirectionType.LeftToRight | ScanDirectionType.TopToBottom;
BarcodeDetail[] datasInDetail = BarcodeScanner.Scan("qrcode-sample.png", ops);

ScanOptions ops = new ScanOptions(BarcodeType.QRCode);
ops.ScanDirection = ScanDirectionType.LeftToRight;
ops.StepInterval = 5;
BarcodeDetail[] datasInDetail = BarcodeScanner.Scan("qrcode-sample.png", ops);