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POError when Databinding with mode=twoway
 

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    <p>All, I'm pounding my head against the wall here. What I need is simple, and I'm sure there is a simple answer, but I can't seem to find it. Situation: I have a Silver light 4.0 app and I'm currently binding a list of strings to an Items control. In the data template for that I have a simple text box that I was doing very basic Binding "{Binding}". I need to update the binding to be twoway so the edits are automatically pushed back to my datacontext. </p> <p>Here is the Items control before I update the binding:</p> <pre><code>&lt;ItemsControl x:Name="spLiftHeader" ItemsSource="{Binding Path=WeekLabels}"&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;StackPanel x:Name="spLiftHeader" Orientation="Horizontal" /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate&gt; **&lt;TextBox x:Name="txtWeekLbl" Text="{Binding}" Foreground="Black" Width="125" TextAlignment="Center"/&gt;** &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;/ItemsControl&gt; </code></pre> <p>Here is the items control after the binding change:</p> <pre><code>&lt;ItemsControl x:Name="spLiftHeader" ItemsSource="{Binding Path=WeekLabels}"&gt; &lt;ItemsControl.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;StackPanel x:Name="spLiftHeader" Orientation="Horizontal" /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ItemsControl.ItemsPanel&gt; &lt;ItemsControl.ItemTemplate&gt; &lt;DataTemplate&gt; **&lt;TextBox x:Name="txtWeekLbl" Text="{Binding Mode=TwoWay}" Foreground="Black" Width="125" TextAlignment="Center"/&gt;** &lt;/DataTemplate&gt; &lt;/ItemsControl.ItemTemplate&gt; &lt;/ItemsControl&gt; </code></pre> <p>I've just simply added the "Mode=TwoWay" to the binding. After updating that, I get the amazingly useless error 4004 "System.Windows.Markup.XamlParseException: Provide value on 'System.Windows.Data.Binding' threw an exception" and the Line/Position reference points right do my updated Binding. How does one add the Two Way mode to the simple binding? Thanks in advance. Nick</p>
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      1. USAndrew Martin
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    1. CO+1 Welcome to Stack Overflow :)
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      1. USGone Coding
 

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