How to save and display how many times a Product is viewed in ASP.Net

hi

I have gridview in my page that bind from database and show product information and when users click on productimage from gridview it will go to Show.aspx page...

I want know that how many users visit each product...

I mean I want see that How many users click on ProductImage from girdview and go to Show.aspx page(separatly for each product)...

How I can do it?

Best Regards..

Neda