I have a WPF Window with a DataGrid. This DataGrid contains a phone number column. The phone number is stored as a string without any formatting such as "9995551234".

How can I display the phone number column with the following format? (999)555-1234

Here is the phone column of my DataGrid with the format that I have tried but this does not work.

DataGridTemplateColumn Header="Phone" Width="100"
DataGridTemplateColumn.CellTemplate
DataTemplate
TextBlock Text="{Binding PhoneNumber, StringFormat={}{0:(###)###-####}}" Width="100"
DataTemplate
DataGridTemplateColumn.CellTemplate
DataGridTemplateColumn.CellEditingTemplate
DataTemplate
TextBox Text="{Binding PhoneNumber, StringFormat={}{0:(###)###-####}}" Width="100"
DataTemplate
DataGridTemplateColumn.CellEditingTemplate
DataGridTemplateColumn