WPF Binding to local variable

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The pattern is:

public string Text {get;set;}

and the binding is 

{Binding Text, RelativeSource={RelativeSource FindAncestor, AncestorType=Window}}

If you want the binding to update automatically you should make it a DependencyProperty.

I think 3.5 added ElementName to bindings, so the following is a little easier:

<Window x:Name="Derp" ...
  <TextBlock Text="{Binding Text, ElementName=Derp}"/>

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