How to extract an integer value from the NewValues property of DetailsViewUpdateEventArgs?

I have a DetailsView control with Edit, Delete and New buttons. After editing the data in the view, and before updating, I need to validate user input, so I have a DetailsView_ItemUpdating method:

    protected void DetailsView1_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)
        lblMsg.Text = "e.NewValues[\"GoalsAgainst\"].ToString() "
                    + e.NewValues["GoalsAgainst"].ToString();

        if (((Int32)(e.NewValues["GoalsFor"]) < 0) || ((Int32)(e.NewValues["GoalsAgainst"]) < 0))
            lblMsg.Text = "Cannot have a negative score";
            e.Cancel = true;

I know that, for example, the data in the "GoalsAgainst" field is a finite integer, because the e.NewValues["GoalsAgainst"].ToString() returns "6". When I try the cast  ((Int32)(e.NewValues["GoalsAgainst"]), however, I get an invalid cast exception, with the additional information that "... When casting from a number, the value must be a number less than infinity."

The online help refers to the "Dictionary" interface, which confuses me more than it helps. What am I missing here?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Have you tried using Convert.ToIn32  ?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.