I would create a Converter. A converter takes one variable and "converts" it to another.
There are a lot of resources for creating converters. They are also easy to implement in c# and use in xaml.
Your converter could look similar to this:
public class DecimalToDoubleConverter : IValueConverter
{
public object Convert(
object value,
Type targetType,
object parameter,
CultureInfo culture)
{
decimal visibility = (decimal)value;
return (double)visibility;
}
public object ConvertBack(
object value,
Type targetType,
object parameter,
CultureInfo culture)
{
throw new NotImplementedException("I'm really not here");
}
}
Once you've created your converter, you will need to tell your xaml file to include it like this:
in your namespaces (at the very top of your xaml), include it like so:
xmlns:converters="clr-namespace:ClassLibraryName;assembly=ClassLibraryName"
Then declare a static resource, like so:
<Grid.Resources>
<converters:DecimalToDoubleConverter x:Key="DecimalToDoubleConverter" />
</Grid.Resources>
Then add it to your binding like this:
Binding ="{Binding Path=NetPrice, Converter={StaticResource DecimalToDoubleConverter}"