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EDITEDITEDIT: Aha! Turns out to be a bloody bug with the Cider design surface! Proof: Try this sequence of XAML lines: <pre><code><StackPanel>  <TextBlock Text="{Binding Path=Value, StringFormat=&#x24;{0}}"/>  <TextBlock Text="{Binding Path=Value, StringFormat=&#x25;{0}}"/>      <TextBlock Text="{Binding Path=Value, StringFormat=&#x28;{0}}"/>  <TextBlock Text="{Binding Path=Value, StringFormat=&#x29;{0}}"/> </StackPanel> </code></pre> I submitted a bug report to connect, we'll see if anyone responds: <a href="https://connect.microsoft.com/VisualStudio/feedback/details/782059/cider-vs2010-designer-bug-with-binding-using-escaped-entities-in-stringformat" rel="nofollow">https://connect.microsoft.com/VisualStudio/feedback/details/782059/cider-vs2010-designer-bug-with-binding-using-escaped-entities-in-stringformat</a> Rest of this answer is semi-moot, albeit potentially useful, since the "bug" is on the designer. The thing to remember here is that XAML is XML, so you need to encode ampersands accordingly: <pre><code>&amp; </code></pre> should work, as well as: <pre><code>&#38; </code></pre> EDIT: Ah, yes - so as discussed in the back-and-forth in the comments, the problem lay not with the ampersand per se, but the "escaping" of the replacement markers within the surrounding braces of a <code>Binding</code> - to fix this, you've actually got three options: EDIT 2: Bah, I think markdown might not like my post (and I was wrong on one point anyway) - let's see if I can cobble a full example together: Just in case, here's a pastebin link as well: <a href="http://pastebin.com/yfrpvxs1" rel="nofollow">http://pastebin.com/yfrpvxs1</a> So say we've got a context object like so: <pre><code>public class Foo : INotifyPropertyChanged { private string _value; public string Value { get { return _value; } set { _value = value; FireNpc("Value"); } } private decimal _numberValue; public decimal NumberValue { get { return _numberValue; } set { _numberValue = value; FireNpc("NumberValue"); } } private DateTime _dateValue; public DateTime DateValue { get { return _dateValue; } set { _dateValue = value; FireNpc("DateValue"); } } public event PropertyChangedEventHandler PropertyChanged = delegate { }; private void FireNpc(string name) { PropertyChanged(this, new PropertyChangedEventArgs(name)); } } </code></pre> And a window codebehind: <pre><code>public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); this.DataContext = new Foo() { Value = "YoMamma", DateValue = DateTime.Now, NumberValue = 3.14m }; } } </code></pre> Let's XAML! <pre><code><Window x:Class="WpfApplication2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <StackPanel>  <TextBlock Text="{Binding Path=Value, StringFormat=#1:Foo &amp; Bar:{0}}"/>  <TextBlock> <TextBlock.Text> <Binding Path="Value" StringFormat="#2:Foo &amp; Bar:{0}"/> </TextBlock.Text> </TextBlock>  <TextBlock Text="{Binding Path=Value, StringFormat=Foo &amp; Bar:{{0}}}"/>  <TextBlock Text="{Binding Path=NumberValue, StringFormat=c}"/>  <TextBlock Text="{Binding Path=DateValue, StringFormat=MM/dd/yyyy}"/>  <TextBlock> <TextBlock.Text> <MultiBinding StringFormat="As of {2:MM/dd/yyyy}, {0} cost {1:c}"> <Binding Path="Value"/> <Binding Path="NumberValue"/> <Binding Path="DateValue"/> </MultiBinding> </TextBlock.Text> </TextBlock> </StackPanel> </Window> </code></pre> Now, piggybacking on that <code>MultiBinding</code>, we can do something stupid - let's add this to our context: <pre><code> // Heh...don't actually do this, naturally... private string _ampersandValue; public string AmpersandValue { get { return _ampersandValue; } set { _ampersandValue = value; FireNpc("AmpersandValue"); } } this.DataContext = new Foo() { Value = "YoMamma", DateValue = DateTime.Now, NumberValue = 3.14m, AmpersandValue = "&" }; </code></pre> And add this XAML: <pre><code>  <TextBlock> <TextBlock.Text> <MultiBinding StringFormat="{}{0} {1} {0} = {0}"> <Binding Path="Value"/> <Binding Path="AmpersandValue"/> </MultiBinding> </TextBlock.Text> </TextBlock> </code></pre>
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