Does a C# `using` statement implicitly close a SQL connection?

The Impact of Using on SQL Connection Closure

In C#, utilizing the using statement provides a concise and automated resource management mechanism. However, when working with open SQL connections, a question arises: does the end of the using block implicitly close the connection?

The answer lies in the behavior of the IDisposable interface. SqlConnection inherits from IDisposable, and when an object implements this interface, it must provide an implementation of the Dispose method. When an object exits a using block, the .Dispose() method is automatically invoked.

For a SqlConnection object, the Dispose method performs cleanup actions, including closing the connection and releasing any associated resources. Therefore, the line cn.close within the using block is redundant. The connection will be closed automatically when the using block завершается.

using cn as new system.data.sqlclient.sqlconnection()
    cn.open
    '//do a bunch of other stuff with commands and datareaders here
end using

In this example, the connection will be closed upon exiting the using block without the need for an explicit call to cn.close.

Remember, the using statement offers a safe and convenient way to manage resources, ensuring proper cleanup and disposal. By utilizing using, you can avoid memory leaks and other resource-related issues in your code.

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