<telerik:RadBarcode runat="server" ID="RadBarcode1"
            Text="Place some text here"
            OutputType="EmbeddedPNG"
            Type="PDF417"
            LineWidth="2"
            Height="50px">
            <PDF417Settings AspectRatio="5" EncodingMode="Text" ErrorCorrectionLevel="0" />
        </telerik:RadBarcode>
        <telerik:RadClientExportManager runat="server" ID="RadClientExportManager1">
            <PdfSettings FileName="Myfile.pdf" />
        </telerik:RadClientExportManager>
        <input type="button" onclick="exportElement()" value="export" />

        <script type="text/javascript">
            function exportElement() {
                var exp = $find("<%= RadClientExportManager1.ClientID %>");
                exp.exportImage($telerik.$("#RadBarcode1"));
            }
        </script>