How to change single cell color of datagrid in wpf?

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C#

ASP.NET

WPF

DataGrid

Please see the screen shot of datagrid here
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I want to change background color of a particular cell of this grid at runtime(show booked seats).i am binding this grid from datatable on window loaded event.i have a record of seats like 'A33'.my code for binding is like this.

MySqlConnection mycon = new MySqlConnection(str);
mycon.Open();
MySqlDataAdapter da = new MySqlDataAdapter("select * from Stage", mycon);
da.Fill(dt);
MyGrid.ItemsSource = dt.DefaultView;