/// <summary>
/// Raises the System.Drawing.Printing.PrintDocument.EndPrint event. It is called
/// when the last page of the document has printed.
/// </summary>
/// <param name="e">A System.Drawing.Printing.PrintEventArgs that contains the event data.</param>
protected override void OnEndPrint(PrintEventArgs e)
{
base.OnEndPrint(e);
if (_printHandle != IntPtr.Zero)
{
Pdfium.FPDFPRINT_Close(_printHandle);
}
_printHandle = IntPtr.Zero;
}