Dmitry,
What language are you using?
The new way of doing things (according to M$ and ADO.NET) you should connect, get your data into a DataSet (or cursor or whatever) and then disconnect.
Einar

>I am making baby steps in creating a simple (test) form using n-tier approach. UI -> BO -> DA. That is, UI through BO asks DA for a record and displays it. As user navigates through records in the table, the cycle "UI->BO->DA" will be done quite often (possibly). The DA is where connection to SQL Server takes place.
>
>Should I close the connection and open a new one on every call to DA or should I make the connection PUBLIC and maintain it for duration of the form being open?
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>Thank you for any suggestions.