Почему я получаю ожидаемую ошибку идентификатора?

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Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        gradeList.Items.Add(textgrade.Text)
        textgrade.Clear()
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim total As Double
        Dim avg As Double
        Dim grade As Double
        Dim gradecount As Integer
        For gradecount = 0 To gradeList.Items.Count - 1
            grade = gradeList.Items.(gradecount) ' <-- ERROR here! --------
            total += grade
        Next
        avg = total / gradeList.Items.Count
        Label3.Text = "Media totală este " & total & vbCrLf & "Scorul total este " & avg
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Label3.Text = String.Empty
    End Sub
End Class

Что я уже пробовал:

Я не знаю, что делать.

grade = gradeList.Items.(gradecount)

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