WPf : Binding with more than one property at a time

Answer 1

Yes. You would use a MultiBinding along with an IMultiValueConverter.

The MultiBinding help shows an example doing exactly what you're attempting - binding one text box to first + last names.

Answer 2

If you're on WPF 3.5SP1 or above, you don't need to write your own value converter for your use case. Instead, just use StringFormat:

<TextBlock>
  <TextBlock.Text>
    <MultiBinding StringFormat="{}{0}, {1}">
      <Binding Path="LName" />
      <Binding Path="FName"/>
    </MultiBinding>
  </TextBlock.Text>
</TextBlock>

HTH, Kent