[tim1979222]

i have a question,i want to build applications wich i want to sale, database applications.so,what is the best way.should i program them in .net 2.0 or in .net 4.0.
.net 4.0 is of course more featuerich,but the customer has to download .net 4.0.
and should i use firebird server or sql server express. i mean for sql server express,the customer has to download service pack,and the sql server,and has 10gb limitation or 4gb limitation for the database.for firebird there is practically no limit, and the setup is easy too. no download and so.pls give me tips.

[Atli]

If you intend to sell this application, you would probably want to build a installer for it, in which case you could just install whichever .NET version you choose during the installation. Using the latest version available to you would seem the logical thing to do if that is the case. - On the other hand, if .NET 2.0 has the features you need to build your application, and you don't care about the new features or updates in .NET 4.0, then you could just use .NET 2.0.

As for databases. That depends on what type of application this is and what it will be used for. Is it a desktop or a server application? Will it really need the speed and capacity of an actual SQL server, or would a file-based database engine, like SQLite or SQL Server Compact, work? - An embed file based engine has an obvious advantage to your users, as they won't have to have a server running on their machines, and they/you can back up or migrate the database by just copying the database file.

Firebird vs MSSQL Server. That one would be decided by what features you need. I can't tell you which is better for you. - There are of course other alternatives as well. Both PostgreSQL and MySQL are free, like Firebird.

[tim1979222]

tnx for your tips, i think i will use firebird or vistadb.
i will build a dekstopdatabase with multiple connections allowed. about mssql i thought,because of linq to sql.
but i dont know if its important linq to sql.