Using Data Source

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Hi!
I´m a newbie with C# and .NET. I´m professional programmer with Delphi and I migrating from Delphi to C# with .NET
..
My questions are:

1) I´m using a single connection string into my application with a unique DataSource. May I load ALL my tables on this unique DataSource and use only data typed objetcs? Will this cause any conflict into database (a lock)?

2) How do I use a query? I want use a query to mount a report. How do I do this?

3) If I load all my tables on a unique DataSource will I use to much memory?

Sorry my poor english, I´m not a native english speaker!

Thanks for help!

Willian Lopes

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