...
row = query.DefaultView[0];
DataContext = row;

<TextBox Text="{Binding Path=Price, Mode=TwoWay}"/>

public class IntToStringConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        int price = (int)value;
        return price.ToString();
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        string text = (string)value;
        int price;
        if (!int.TryParse(text, out price))
        {
            MessageBox.Show("Enter valid value for Price!");
            return 0; //Some default value
        }

        return price;
    }
}