Convert SqlDataSource to DataTable and DataView

I have the following SqlDataSource and I want to convert it to DataView and read a column from it:

SELECT     
    dbo.Divisions.DivisionShortcut, 
    COUNT(DISTINCT dbo.UserQuiz.Username) AS [Number of Participants]
FROM         
    dbo.Divisions 
INNER JOIN
    dbo.employee ON dbo.Divisions.SapCode = dbo.employee.DivisionCode 
INNER JOIN
    dbo.UserQuiz ON dbo.employee.Username = dbo.UserQuiz.Username 
INNER JOIN
    dbo.Quiz ON dbo.UserQuiz.QuizID = dbo.Quiz.QuizID
WHERE     
    (dbo.Quiz.QuizID = @QuizID)
GROUP BY 
    dbo.Divisions.DivisionShortcut

This SqlDataSource lets the user enter the number of the Quiz, and it will retrieve the total number of participants in that quiz. I want to convert this SqlDataSource to a DataTable and read a column from it.

So how to do that?