<dxgn:GanttControl ItemsSource="{Binding Tasks}">
    <dxgn:GanttControl.View>
        <dxgn:GanttView PrintArea="EntireControl"
                        PrintDateRange="(10/5/2020)-(10/18/2020)"
                        x:Name="ganttView"/>
    </dxgn:GanttControl.View>
</dxgn:GanttControl>

void ExportData(object sender, System.Windows.RoutedEventArgs e) {
    ganttView.ExportToPdf(@"c:\Examples\gantt_export.pdf");
}

Private Sub ExportData(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs)
    ganttView.ExportToPdf("c:\Examples\gantt_export.pdf")
End Sub

void ExportData(object sender, System.Windows.RoutedEventArgs e){
    ganttView.ExportToXlsx(@"c:\Examples\gantt_export.xlsx");
}

Private Sub ExportData(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs)
    ganttView.ExportToXlsx("c:\Examples\gantt_export.xlsx")
End Sub

<Window xmlns:dxgn="http://schemas.devexpress.com/winfx/2008/xaml/gantt"
        xmlns:dxgnn="http://schemas.devexpress.com/winfx/2008/xaml/gantt/internal">
    <Window.Resources>

        <Style x:Key="customPrintTimescaleRulerStyle" TargetType="{x:Type dxgnn:TimescaleRulerControl}">
            <Setter Property="Background" Value="White"/>
        </Style>

        <Style x:Key="customPrintMilestoneStyle" TargetType="{x:Type dxgn:GanttMilestoneControl}">
            <Setter Property="Background" Value="#0173C7"/>
        </Style>

        <Style x:Key="customPrintMilestoneBaselineStyle" TargetType="{x:Type dxgn:GanttMilestoneBaselineControl}">
            <Setter Property="Background" Value="Gray"/>
            <Setter Property="BorderThickness" Value="0"/>
            <Setter Property="Opacity" Value=".5"/>
        </Style>

        <Style x:Key="customPrintTaskBaselineStyle" TargetType="{x:Type dxgn:GanttTaskBaselineControl}">
            <Setter Property="Background" Value="Gray"/>
            <Setter Property="Opacity" Value=".5"/>
        </Style>

        <Style x:Key="customPrintSummaryTaskBaselineStyle" TargetType="{x:Type dxgn:GanttSummaryTaskBaselineControl}">
            <Setter Property="Background" Value="Gray"/>
            <Setter Property="Opacity" Value=".5"/>
        </Style>

    </Window.Resources>
    <dxgn:GanttControl ItemsSource="{Binding Tasks}" ...>
        <dxgn:GanttControl.View>
            <dxgn:GanttView PrintArea="Gantt"
                            PrintDateRange="(9/15/2020)-(9/25/2020)"
                            PrintTimescaleRulerStyle="{StaticResource customPrintTimescaleRulerStyle}"
                            PrintMilestoneStyle="{StaticResource customPrintMilestoneStyle}"
                            PrintMilestoneBaselineStyle="{StaticResource customPrintMilestoneBaselineStyle}"
                            PrintTaskBaselineStyle="{StaticResource customPrintTaskBaselineStyle}"
                            PrintSummaryTaskBaselineStyle="{StaticResource customPrintSummaryTaskBaselineStyle}"/>
        </dxgn:GanttControl.View>
        ...
    </dxgn:GanttControl>
</Window>