Databinding and Nullable Types

In this article (Using WPF Binding StringFormat property with nullable types) Karl Shifflett describes how to bind to properties that have a nullable type.

In summary, use TargetNullValue property of the binding like this:

<TextBox
Text="{Binding Path=NumberOfComputers,
TargetNullValue={x:Static sys:String.Empty},
StringFormat=\{0:D\}}" />

TargetNullValue requires .NET 3.5 Framework Service Pack 1. Previously this would have required a IValueConverter class to deal with the Null values.