test.cs

// new non-UI ServerTextControl
using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) {

    tx.Create();

    // create a new Barcode object
    TXTextControl.Barcode.TXBarcodeControl txBarcode1 =
        new TXTextControl.Barcode.TXBarcodeControl();

    var sBarcodeText = "www.textcontrol.com";

    txBarcode1.BarcodeType =
            TXTextControl.Barcode.BarcodeType.QRCode;
    txBarcode1.UpperTextLength = sBarcodeText.Length;
    txBarcode1.Text = sBarcodeText;
    txBarcode1.Name = "uniqueId";

    // create a Barcode frame object
    TXTextControl.DataVisualization.BarcodeFrame bf =
            new TXTextControl.DataVisualization.BarcodeFrame(txBarcode1);

    // add the frame with the Barcode to the document
    tx.Barcodes.Add(bf, -1);
}