Question

What is the maximum allowed size for a SQLite database in a Windows Forms application?
Can I use PetaPoco as an ORM, or can you suggest a similar ORM?

Answer 1

Concerning your max size question the limit is about 14 terabytes (http://www.sqlite.org/limits.html).

And I think you can use PetaPoco, since this lines can be found in PetaPoco.cs:

    enum DBType
    {
        SqlServer,
        SqlServerCE,
        MySql,
        PostgreSQL,
        Oracle,
        SQLite
    }