How to setup a site application on WLAN - database

I'm very new to setting up databases so please bear with me.
My application(MVC4 with Entity Framework) is has been running locally in IIS Express on my development computer. I was wondering if someone connected in my WLAN network can access it by typing in localhost:XXXXX on their chrome?
I don't need my site on the internet! I just want it to be able to be accessed by people in my WLAN network
Do I need to pay for some kind of database service ? If so can someone link me to one.
Can someone list options for me please.

I was wondering if someone connected in my WLAN network can access it
by typing in localhost:XXXXX on their chrome?
No, localhost is the address for the local machine. So if someone types localhost:XXXX in a browser on their machine, it would point to IIS Express running (if any) on their machine.
If you want someone in your network access the website running on your computer, you can simply deploy it in IIS running on your machine. Then they could type in your computer's IP address (or name) and access your website provided your machine is turned on and IIS related services are running on your machine :).

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Thanks in advance.
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HTH

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Exactly what you can do there? I know you can access SQL server over the internet, but is it secure if you use SSL encryption? Also what would be the easiest solution to access a network share?
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