Closing SqlConnection and SqlCommand c#

In my DAL I write queries like this:

using(SQLConnection conn = "connection string here")
{
    SQLCommand cmd = new ("sql query", conn);
    // execute it blah blah
}

Now it just occurred to me that I am not explicitly closing the SQLCommand object. Now I know the 'using' block will take care of the SQLConnection object, but will this also take care of the SQLCommand object? If not than I have a serious problem. I would have to put in the 'using' on the SQLCommand on thousands and thousands of lines of code or do a cmd.Close() on hundreds of methods. Please tell me that if putting in the using or closing the command will provide a better memory management of the web app?