http://msdn.microsoft.com/en-us/library/system.windows.data.bindingbase.stringformat(v=vs.110).aspx

Compare.xaml

Bad:
<TextBlock Text=" (" FontWeight="Bold"></TextBlock>
<TextBlock Text="{Binding Path=ShortName}" FontWeight="Bold"></TextBlock>
<TextBlock Text=")"  FontWeight="Bold"></TextBlock>

Good:
<TextBlock Text="{Binding Path=ShortName, StringFormat={} ({0})}" FontWeight="Bold" />


Multibinding:
                <TextBlock>
                    <TextBlock.Text>
                        <MultiBinding StringFormat="Delete {0} {1}">
                            <Binding Path="FirstName" />
                            <Binding Path="LastName" />
                        </MultiBinding>
                    </TextBlock.Text>
                </TextBlock>