I plan to use Aspose dll for some minor process of pdf programmatically using c#. Can I use your dll as itextsharp dll? they will not charge for any thing and they are open source too. Kindly explain me the license stuffs if I have confused. 
Hi Nachiappan,
Thanks for your inquiry. Aspose is a commercial vendor of file format APIs, all APIs are paid so Aspose.PDF for .NET API as well. However for evaluation purpose you may ask for a 30 days temporary license and if satisfied then can purchase API as per your plan.
Please feel free to contact us for any further assistance.
Best Regards,