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ADO.NET Connection and Command Timeout

Provided by: Dave Juth, Senior Systems Architect

The SqlConnection and SqlCommand objects each have a property to set a timeout value (ConnectionTimeout and CommandTimeout, respectively). You should note that the SqlConnection.ConnectionTimeout is the time allowed to establish a connection, and the SqlCommand.CommandTimeout is the time allowed to return data from a query or complete a data operation. The connection object's timeout is sometimes mistaken as a way to control how long an application waits for a query result, which is not the case and can be a "gotcha" for developers.

If you use older versions of the Microsoft Enterprise Library's Data Access Application Block, you cannot set a timeout value for a command object directly. This is another thing to be aware of when creating a database application with relatively complex queries or large amounts of data.

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