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You need to add optional parameter(username in your case) to PayPal request and PayPal returns it in response ...<br />
About session : You can change session time (20 min by default) in web.config
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You need to add optional parameter(username in your case) to PayPal request and PayPal returns it in response ...
About session : You can change session time (20 min by default) in web.config

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Thanks for the reply ....<br />
How can I send value of user name from my session variable to the html button code optional parameter.<br />
Can you please give that code.
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Thanks for the reply ....
How can I send value of user name from my session variable to the html button code optional parameter.
Can you please give that code.

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<div class="content wysiwyg-content">
Hi all,<br />
I am Integrating pay pal to my site and using Pay pal PDT.<br />
i AM USING HTML BUTTON OF PAY PAL AND i AM SETTING SEESION[uSERNAME&quot;] IN my pay pal button page. from there it goes to pay pal and returns back &nbsp;to my thank you page.<br />
On my thank you page I am reading this session.<br />
Sometimes its there and sometimes it null.<br />
Some times Session expires after returning from pay pal to My site after payment.<br />
P-lease let me know the reason if you can guess
</div>
</div>


Hi all,
I am Integrating pay pal to my site and using Pay pal PDT.
i AM USING HTML BUTTON OF PAY PAL AND i AM SETTING SEESION[uSERNAME"] IN my pay pal button page. from there it goes to pay pal and returns back  to my thank you page.
On my thank you page I am reading this session.
Sometimes its there and sometimes it null.
Some times Session expires after returning from pay pal to My site after payment.
P-lease let me know the reason if you can guess

Session expires after returning from pay pal to My site after payment.

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

Electronic commerce (e-commerce) is the trading in products or services using computer networks, such as the Internet. E-commerce draws on technologies such as mobile commerce, electronic funds transfer (EFT), supply chain management, online transaction processing, electronic data interchange (EDI), inventory management systems, and automated data collection systems. Use this topic to discuss online shopping carts, online marketplaces, and e-commerce platforms.

E-Commerce

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).