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How To Paint Or Set WPF DataGridCell Background Without Using IValueConverter

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Here's how to paint WPF DatagridCell using extension methods without using IValueConverter.
Extension Method: 
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Module DataGridExtensions
    <Extension()>
    Function GetRow(ByVal grid As DataGrid, ByVal index As Integer) As DataGridRow
        Dim row As DataGridRow = DirectCast(grid.ItemContainerGenerator.ContainerFromIndex(index), DataGridRow)
        If row Is Nothing Then
            grid.UpdateLayout()
            grid.ScrollIntoView(grid.Items(index))
            row = DirectCast(grid.ItemContainerGenerator.ContainerFromIndex(index), DataGridRow)
        End If
        Return row
    End Function
End Module

MainWindow.xaml: 
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Dim firstRow As DataGridRow = grid1.GetRow(0) 'grid1 is your DataGrid control
Dim firstColumnInFirstRow As Controls.DataGridCell = DirectCast(grid1.Columns(0).GetCellContent(firstRow).Parent, Controls.DataGridCell)
'set background
firstColumnInFirstRow.Background = Brushes.Red

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