データのバインド

using System.ComponentModel;

public class BarcodeData : INotifyPropertyChanged
{
        public BarcodeData()
        {
                Data = string.Empty;
        }
        private string barcodeData;
        public string Data
        {
                get
                {
                        return barcodeData;
                }
                set
                {
                        barcodeData = value;
                        RaisePropertyChanged();
                }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        private void RaisePropertyChanged()
        {
                if (PropertyChanged != null)
                {
                        PropertyChanged(this,
                        new PropertyChangedEventArgs("Data"));
                }
        }
}

var barcodeData = new BarcodeData();
Barcode.BindingContext = barcodeData;

<ig:XamQRCodeBarcode x:Name="Barcode" Data="{Binding Data}" />

barcodeData.Data = "324654";