ASP.NET下水晶报表的导出成pdf格式的方法

private void Button2_Click(object sender, System.EventArgs e)
{

CrystalReport1 test=new CrystalReport1();

ExportOptions exportOption=new ExportOptions();
DiskFileDestinationOptions diskOption=new DiskFileDestinationOptions();
exportOption=test.ExportOptions;

exportOption.ExportFormatType=ExportFormatType.PortableDocFormat;
exportOption.ExportDestinationType=ExportDestinationType.DiskFile;

diskOption.DiskFileName=@"C:/test.txt";
exportOption.DestinationOptions=diskOption;

test.Export();

}