Can I have one wpf control bind to two sources? - wpf

Question

Basically I have two textboxes which binds to two columns of a ListView. When the user select one row in the ListView, the values will be displayed in the textboxes. This has no problem.
The user can edit the text of one TextBox, the other TextBox is not editable. The text of the second TextBox is based on the text of the first TextBox. For example, the first box is product price in Chinese yuan and second box is product price in British pound. The exchange rate is from setting. The user can only edit value of Chinese yuan, but not British pound. The sold price is initially from database.
My purpose is when the user change the first TextBox, then in the text_changed event, I calculate the value for the second TextBox.
When the end user change selection to the ListView, It seems to me the binding to GoodsSoldPriceCN happened first, then this triggered the text_changed event. In the event handler, I calculate the sold price in pound for the second TextBox and this two-way binding will update source. The problem is this wouldn't update the row the user just selected, but update the row the user previously selected.
So, my question is how can I achieve this requirement.
Two textboxes bind to the selection of a row of a ListView.
The second text box also bind to the text of the first box when the user manually change the text of the first TextBox.
My code is as follows:
XAML
<TextBox Grid.Row="2" Grid.Column="1" HorizontalAlignment="Stretch" Name="GoodsSoldPriceCN" Style="{StaticResource textBoxInError}" TextChanged="GoodsSoldPriceCN_TextChanged">
<TextBox.Text>
<Binding Path="soldpricecn" ConverterCulture="zh-cn">
<Binding.ValidationRules>
<ValidationRules:MoneyValueRule Min="1" Max="100000"></ValidationRules:MoneyValueRule>
</Binding.ValidationRules>
</Binding>
</TextBox.Text>
</TextBox>
<TextBox Grid.Row="3" Grid.Column="1" HorizontalAlignment="Stretch" Name="GoodsSoldPriceGB" IsEnabled="False" Style="{StaticResource textBoxInError}" Text="{Binding Path=soldpricegb, Converter={StaticResource MoneyValueConverter}, UpdateSourceTrigger=PropertyChanged, ConverterCulture=en-gb}" />
Code
private void GoodsSoldPriceCN_TextChanged(object sender, TextChangedEventArgs e)
{
isDirtyOrder = true;
ListViewItem item = e.OriginalSource as ListViewItem;
try
{
if (!String.IsNullOrEmpty(GoodsSoldPriceCN.Text))
GoodsSoldPriceGB.Text =
(decimal.Parse(GoodsSoldPriceCN.Text) / decimal.Parse (Properties.Settings.Default.ExchangeRate)).ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
...
}

Answer 1

I use Binding.SourceUpdated event instead of TextChanged event and that solve the problem.