单项选择题
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You add a DataGrid named gridContacts that is data-bound to a collection of Contacts. Each item has the ContactName and Phone properties.
The DataGrid contains a column named ContactNameColumn that is bound to ContactName.
You write the following code fragment.
You need to ensure that the application meets the following requirements:
Phone number is shown as a row detail when the row is selected.
Only ContactName can be edited.
What should you do?（）
A.
B.
C.
D.
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