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1)Like how it will integrate with my code.
Payment gateway service provider provides the detail about how to integrate with the site(usually a pdf file will be given which include codes,mandotory fileds to be passed,form design etc)
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2)Do I need to use any third party controls for it and which is the best third party tool for this integration which is more secured.
It's upto your requirements.Paypal is one of the best(Just my opinion)
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How much they charge
It depends on the package you purchase
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4)Is this amount will be payable my client or by me.
The purchasing cost is usually paid by clients
Contact a Payment gateway service provider according to your needs.They provide the necessary Information to integrate payment gateway with the Site.
You have to take
Griff's answer[
^] seriously .
Refer here to get an idea:
Introduction to PayPal for C# - ASP.NET developers[
^]
PayPal Gateway Integration in ASP.NET[
^]
Use of the PayPal payment system in ASP.NET[
^]