help in setting up two internet connection in the same network

help in setting up two internet connection in the same network

here's the setup i want:

2 Router with 2 different service provider

then connect it to the network

i have 48 computers in the network i want to seperate the internet connections they're going to use without affecting the file sharing and communication in the network

E.G

1st router with 24 clients
2nd router with 24 clients

and they must be networked together.. thanks..