Find duplicate Rows and highlights in WPF

Question

I have a datagrid view in my WPF Form.

 

 

I want to highlight the Row duplicates based on the LicenseName.

 

I bind a datatable to my Gridview as follows.

 

public DataTable table = new DataTable();
        private void showdetailsbtn_Click(object sender, RoutedEventArgs e)
        {
            table.Columns.Add("Subcategoryname", typeof(string));
            table.Columns.Add("Totallicense", typeof(int));
            table.Columns.Add("Inuse", typeof(int));
             // Here we add five DataRows.
            table.Rows.Add("Indocin", 10,10);
            table.Rows.Add("Indocin", 20, 10);
            table.Rows.Add("Hydralazine", 5,4);
            table.Rows.Add("Combivent", 11,2);
            table.Rows.Add("Dilantin", 6,3);

            licensegridview.DataContext = table;
  }

 Please help me to solve my problem .