fencing costs

i want to fence my 10 acreas of farm what is the best and cheapest way to do it regrds

I am Damodara Das from ISKCON Salem, Tamilnadu INDIA. I am facing problems on our farm from Wild Pigs. I have come across people telling some ways to avoid this. Some are saying chain link fencing is useful, some say solar fencing, some say digging deep trenches as fencing helps while some says...