Securing informaton on url ?

Question

I am using a HyperLink Column in DataGrid and are settting these properties :

  url Field:
  id
  url Forma tString:
  menuList1.aspx?pid={0}

now problem is that, this information is passing on url to another page without encryption ex.
  http://localhost/CharliesGarage/admin/menuList1.aspx?pid=1 

while I want to secure this information so that no body can tampared on this information on the browser.
Please solve my problem as soon as possible.