WPF and String.Format() method

Hi Guys,

I am implementing a Point of Sale system UI. I have textblock and a uniformgrid fill with buttons. in the button's click event, I have some code. Here is the code:

<TextBlock VerticalAlignment="Top" TextAlignment="Right" Text="0" x:Name="testTxt" Margin="20" Height="32" FontSize="20"  /><UniformGrid ButtonBase.Click="button_Click"  FlowDirection="LeftToRight" VerticalAlignment="Top" Margin="20,60"><Button Content="1" /><Button Content="2" /><Button Content="3" /><Button Content="4" /><Button Content="5" /><Button Content="6" /><Button Content="7" /><Button Content="8" /><Button Content="9" /><Button Content="9" /></UniformGrid>

I do not want to use binding, but simply update the textblock whenever a button is clicked. Before updating the textblock though, I want to format the text as a currency. I have written this code:

string text = "";
private void button_Click(object sender, RoutedEventArgs e)
{
       text += (e.OriginalSource as Button).Content.ToString();


       testTxt.Text = string.Format("{0:c}", text);
}

The problem is the data is returning from string.Format without the formatting. However, if I wrote

string.Format("{0,6:c}", text);

, I get the padding, but not the currency format. Can anyone help me out? Thanks.

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