Should I Explicitly Close a SqlConnection Inside a Using Block?

Using Keyword in SQL Connections: Close or Not?

When utilizing the using keyword to wrap a SQLConnection object, a common question arises: should the connection be explicitly closed within the using block, or is this handled automatically?

The answer lies in the behavior of the using keyword. When exiting a using block, the .Dispose() method is invoked on the contained object. For a SqlConnection, .Dispose() automatically closes the connection and releases any associated resources.

Code Example:

Consider the following code snippet:

using cn as new system.data.sqlclient.sqlconnection()
    cn.open
    '{do a bunch of other stuff with commands and datareaders here}
    cn.close 'Do I need this?
end using 

Explanation:

The using block in this example automatically closes the SQLConnection object named cn when the block is exited. Therefore, the explicit call to .close() after the using block is redundant and unnecessary.

Conclusion:

When using the using keyword to manage SQL connections, the connection will be automatically closed upon exiting the block through the invocation of .Dispose(). Explicit calls to .close() within the block are superfluous and should be omitted.

The above is the detailed content of Should I Explicitly Close a SqlConnection Inside a Using Block?. For more information, please follow other related articles on the PHP Chinese website!