【单选题】
You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. <br /> You write the following code fragment. <br /> <img src="https://nimg.ppkao.com/2018-07/yiyu/2018072715223481138.jpg?sign=1294ffd6cb7d2b55601ad8f4933d3cf3&t=62d20ebf" /><br /> <textbox text="{Binding Path=StringMember}">You need to ensure that the StringMember property of the data-bound object is updated immediately when the user types the TextBox control. <br /> Which binding expression should you use?（）</textbox>
A、 { Binding Path=StringMember, Mode=TwoWay }
B、 { Binding Path=StringMember, NotifyOnSourceUpdated=True }
C、 { Binding Path=StringMember, NotifyOnTargetUpdated=True }
D、 { Binding Path=StringMember, UpdateSourceTrigger=PropertyChanged }
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