Questions about database connection

Question

1. Is it possible to just share my program that is already installed in my computer so that the other who is/are connected to the wifi can use it?

2. How can i change my database string to permanent? Like after installing my C# application to another computer, i want to run it without changing the database string? Do i really need to use SQL server? What version of sql server is compatible with my visual studio ultimate 2013? Is there any compatibility on that or i can just use any version of sql server?

3. Is it possible to use SQL server using only wifi and not LAN? Do i really need to use windows server 2008/2012 or is it ok to use windows 7, 8.1 ,10?

Thank you in advance to those who will answer. Also, you can share links for tutorials about my questions above.

Here's my database connection on my C# program..

 

 

 

SqlConnection con = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=C:\Users\HP\Documents\Visual Studio 2013\Projects\Coding\Coding\Coding.mdf;Integrated Security=True;Connect Timeout=30");