How do I perform formating in Databound field?

I have a text block that I am doing some basic databinding and it works well but I want to have the databound item formated to currency, Can you do this in the XAML?

I have included my code below.
<TextBlock Height="21" Name="txtYTDTotal" Text="{Binding YTD_Total, Mode=TwoWay}" />

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jmarbuttAsked:
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TSmoothCommented:
Yes, look into using a ValueConverter (IValueConverter interface). Here's an article to get you started:
http://www.silverlight-help.com/tips/kentucker/09-03-27/Formatting_bound_data_in_Silverlight_2.aspx
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unmeshdaveCommented:
well normally valueconverter u have to use when u want to display something based on field value (ie if each different value have different formating).
for simple formatting like this,
you can use Stringformat attribute of Binding.
as the attached code.
http://msdn.microsoft.com/en-us/library/system.windows.data.bindingbase.stringformat.aspx  

<TextBlock Height="21" Name="txtYTDTotal" Text="{Binding YTD_Total, StringFormat={}{0:C}, Mode=TwoWay}" />
 

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jmarbuttAuthor Commented:
unmeshdave,

I get an error of

"The property 'StringFormat' was not found in type 'Binding'"

When I try your solution, I am missing something simple.
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unmeshdaveCommented:
it comes with .Net 3.5 SP1. so make sure u have installed that.
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TSmoothCommented:
unmeshdave, I think he's working with Silverlight which does not support the "StringFormat" binding parameter. That's why I went with IValueConverter.

jmarbutt,
If you are using Silverlight, you will need to do it the way I originally posted and you don't need to install .NET 3.5 SP1. If you are using WPF, then unmeshdave's answer should work and be easier.
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unmeshdaveCommented:
yes if he is using SL then Stringformat will not work as of now.
jmarbutt:
If you are using SL you need to use valueconverter as TSmooth Suggessted.
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jmarbuttAuthor Commented:
Yeah that should work then with SL. Sorry for the mix up.
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TSmoothCommented:
From what I can tell following this thread, jmarbutt used my initial solution.
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