Question: I know this is not a technical related question.But i do not have any idea.I am going to develop a project which should be supported in both phone and tablet.Is it possible having one project working for both tablet and phone ?

Answer: 
MySql can handle very large projects, it's stable, updated and free, so I think you shouldn't think to go on with Access.  

Connecting to MySql will be quite easy: include MySql.Data.dll and change db connection string, it's easy and you'll find a lot of examples on internet.  

If your app should only talk with db in intranet, simply install MySql on a server and connect your app using server ip and port.
If you are the one that has to maintain the application also in future then drop the idea of Access and change into MySQL.
Access is only for personal use (or maybe with some small number of co-users)