I have a form in WPF with 2 textbox :

<TextBox Name="txtName" Text="{Binding Contact.Name}"/>
<TextBox Name="txtAddressNumber" Text="{Binding Contact.Address.Number}"/>

and I have 2 class :

public class ContactEntity
{
  public string Name {get;set;}
  public AddressEntity Address {get;set;}
}

public class AddressEntity
{
  public int Number {get;set}
}

The Name property binds fine. But the Number property of the Address object inside the Contact object does not binds. What I'm doing wrong ?