I have to implement ccavenue payment gateway in asp.net.
I have searched lot on the internet but not able to find single working example with asp.net.
I have tried example from site also but it is not documented and not proper . I have no idea about how to use this service with asp.net .
After following this step you can integrate Avenue gateway to your button
For details refer this -
http://bhartiwebworld.blogspot.in/2013/09/how-to-do-ccavenue-payment-gateway.html
You can also integrate using magento. For magento check this video -