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PODataBinding to Calculated Field
 

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    <p>I'm running into a small problem where I'm trying to bind a DataTextColumn of a DataGrid to a Calculated Field. </p> <p>WPF </p> <pre><code>&lt;DataGrid ItemsSource="{Binding Path=CurrentRoster, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" AutoGenerateColumns="False" AlternatingRowBackground="Gainsboro" AlternationCount="2"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridComboBoxColumn Header="Student Enrolled" ItemsSource="{Binding Source={StaticResource AvailableStudents}}" SelectedItemBinding="{Binding Path=Student}"&gt; &lt;/DataGridComboBoxColumn&gt; &lt;DataGridTextColumn Header="Registration" Binding="{Binding Path=RegistrationCosts, StringFormat='{}{0:C}'}"/&gt; &lt;DataGridTextColumn Header="Lodging" Binding="{Binding Path=LodgingCosts, StringFormat='{}{0:C}'}"/&gt; &lt;DataGridTextColumn Header="Travel" Binding="{Binding Path=TravelCosts, StringFormat='{}{0:C}'}"/&gt; &lt;DataGridTextColumn Header="Dining" Binding="{Binding Path=DiningCosts, StringFormat='{}{0:C}'}"/&gt; &lt;DataGridTextColumn Header="Total Costs" IsReadOnly="True" Binding="{Binding Path=TotalCosts, StringFormat='{}{0:C}'}"/&gt; &lt;/DataGrid.Columns&gt; </code></pre> <p>Where Student is a Entity object with one small addition. TotalCosts isn't a field on the db tables, so I created a partial class for this. </p> <pre><code>public partial class Student { public Decimal TotalCosts { get { return (LodgingCosts + RegistrationCosts + TravelCosts + DiningCosts); } } } </code></pre> <p>The problem I'm experiencing is that TotalCosts is not automatically updating when you fill in any of the other fields. My guess it is because it is not listed as a dependency property. How do I resolve this for a property where there is no set ?</p>
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