Is `SqlConnection.Close()` Necessary Inside a `using` Statement?

SqlConnection.Close() Inside a Using Statement

In the provided code:

using (sqlConnection = new SqlConnection(sqlConnectionString_WORK))
{
    sqlConnection.Open();

    // ...
}

The question arises: is it necessary to explicitly call sqlConnection.Close() before disposing of the connection inside the using statement?

Answer:

No, it is not necessary to call sqlConnection.Close() explicitly. The using statement will automatically take care of closing and disposing of the connection when the code block is exited.

The primary purpose of the using statement is to ensure that any IDisposable resources allocated within the block are properly disposed of, even if an exception occurs. This includes automatically closing connections and other unmanaged resources.

As Microsoft Learn states:

"The following example creates a SqlConnection, opens it, [and] displays some of its properties. The connection is automatically closed at the end of the using block."

By utilizing the using statement, you simplify resource management and reduce the risk of resource leaks or unhandled exceptions.

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