private void OpenPdfFile(string filename)
{
    try
    {
        ClientScript.RegisterStartupScript(this.GetType(), "showPdfFile", "<script language='javascript' type='text/javascript'>function A() {window.open('MapSuite PDF Map.pdf');};A();</script>");
    }
    catch (Win32Exception ex)
    {
        if (ex.Message == "No application is associated with the specified file for this operation")
        {
            ClientScript.RegisterStartupScript(this.GetType(), "showPdfFile", "<script language='javascript' type='text/javascript'>function A() {alert('Failed to generate PDF file.');};A();</script>");
        }
    }
}