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public class SampleData : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public SampleData(string substance, string result)
    {
        Substance = substance; Result = result;
    }   
   
    private string _Substance = "";
    public string Substance
    {
        get { return _Substance; }
        set
        {
            _Substance = value;
            FirePropertyChanged("Substance");
        }
    }
    private string _Result = "";
    public string Result
    {
        get { return _Result; }
        set
        {
            _Result = value;
            FirePropertyChanged("Result");
        }
    }
    
    private void FirePropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}