What should I be using for an embedded database?

I'm still learning C# in the .NET environment and I'm currently working on a Windows desktop app. I've read that LocalDB can be used as an embedded database if I want to let other people buy any apps I make in the future. But I've also read that SQL Server
Compact Edition is what I should be using and those sources say that LocalDB isn't suitable for an app that's made so that other people can buy it. Which is correct? Is SQL Server Compact Edition still being developed by Microsoft?
I've got a laptop with 64 bit Windows. If I install a 64 bit version of the either of the above database software can I still make 32 bit database files for use as embedded databases for C# apps?
I'm interested in learning to make Windows desktop apps as well as Windows Store apps and apps for Windows tablets.
I've read about SQLite but I'm thinking either LocalDB or SQL Server Compact Edition would be more compatible with C# code. Am I right? I'm using Visual Studio Community 2013 on Windows 8.1.
I've read about the SQL Server Compact/SQLite Toolbox by ErikEJ
Thanks

You cannot use SQL for a mobile application.
I would suggest using SQLLite and it is not very complicated to use with c#.
If you select 32-bit version of the database, you will not have compatibility issues. It will work for both 32-bit and 64-bit systems.
Even if you select SQL Lite you cannot use it both from mobile and desktop devices. You will face serious issues.
What I suggest is to have an online database and read from there to your local databases if you wanna use a database.
You can reach that database with web service(WEB API).

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Dear all:
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*** 2010-08-05 16:13:26.608
*** SESSION ID:(572.533) 2010-08-05 16:13:26.608
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