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Event Handler Code for Empty Cart Button

The next button on the DisplayCart.aspx we will deal with is the EmptyCart button. Pressing this button will both clear the CartContents from Session State, and clear the lstCart Listbox, indicating that all items have been deleted. Double-Click the Empty Cart button in Design View and enter the following code:

    'Event Handler for Empty Shopping Cart
    Protected Sub btnEmpty_Click(ByVal sender As Object, _
        ByVal e As EventArgs) Handles btnEmpty.Click

        'If the Cart isn't already empty:
        If CartContents.Count > 0 Then

            'Clear Session State & ListBox
            CartContents.Clear
            lstCart.Items.Clear
        End If

    End Sub

Run the program and add your favorite items. You can stop at 2 or 3, there probably isn't any point in going past 5 or 10. Press the Empty Button to make sure the ListBox clears. If it doesn't cut and paste the code above, and try again. Make sure the program is running smoothly before proceeding to the next step.

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In order to continue with this guide, and begin the discussion on Emptying The Shopping Cart Press the Button below:

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