c# - Cell color of WPF DataGrid back to the default -

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I am using buildin WPF DataGrid using .NET 4.

I can do a set of backgrounds like the DataGridCell Programmers below. 

  DataGridCell dgc = this.GetCell (i, j); // GetCell's extension is func dgc.Background = Brushes.LightGray;

My question is, how can I set the background color and return it to the default? By "default" I mean that if the cell is selected, the default transparent background with blue color. If I just set the cell background back to the bottom, 

  dgc.Background = Brushes.Transparent;

Then, this auction is not created when it is chosen.

dgc.ClearValue (DataGridCell.BackgroundProperty);

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