xceed datatgrid export to excel Xceed.Wpf.DataGrid.Export.ExcelExporter class is not found

Question

I am trying to export a DataGrid's data to excel. I tried it using the xceed document (see the code below).

But there, I was not able to find Xceed.Wpf.DataGrid.Export.ExcelExporter

public static void ExportToExcel(Xceed.Wpf.DataGrid.DataGridControl dg, string File_Name)
{
    try
    {
       Xceed.Wpf.DataGrid.Export.ExcelExporter exporter = new ExcelExporter(dg);
        // All details
        exporter.DetailDepth = int.MaxValue;
        // Use the current system list separator
        exporter.FormatSettings.Separator = CultureInfo.CurrentCulture.TextInfo.ListSeparator[0];
        exporter.Export("d:\\orders.csv");
        MessageBox.Show("Excel File has been Saved");
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}