Smart Park model

Hey!!

I'm bulding a model of smart parking system that can guide the user to free parking.
I've made it with arduino uno and with some mengnatic sensors.
Also I've built a web-site with .net (on the cloud)

Now I need to connect between the arduino and his sensors to the web site. for example I need to know the status of the parking and to "send" the user to this parking.

I've read that there is couple options - ethernet shield or rs-232.
Can you help me to understand which of them is better for me?

TNX!

I've read that there is couple options - ethernet shield or rs-232.

An ethernet shield lets you connect to a router which will let you connect to the internet.

An RS-232 shield lets you connect to one other RS-232 device.

The choice is pretty obvious.

OK.

Tnx!

Ive got another quesstion -

I've built a application web-site with .net and I'm planning to storage it on AWS servers.

Can you explain me how the connection between the arduino and my web-site works?

How can I use the sensors indication that they will show up in the web-site?

someone PLIZZ