如果执行SqlCommand并超时,则相应的SqlConnection是否已关闭和/或处理？

using (SqlConnection connection = new SqlConnection(connectionString))
{
    try
    {
        connection.Open();
        SqlCommand command = new SqlCommand(sqlQuery, connection);
        command.CommandTimeout = 30; // 设置超时时间为30秒
        SqlDataReader reader = command.ExecuteReader();
        // 处理查询结果
    }
    catch (SqlException ex)
    {
        // 处理异常
    }
    finally
    {
        connection.Close();
    }
}