VB If statement for Varible after removing amount its not enough when i get it back up

Im making a cookie clicker type game and it wont let me Do an if statement more then once? its just returning false even when true

Private Sub btnUpgrade_Click(sender As Object, e As EventArgs) Handles btnUpgrade.Click
    If cake = 10 Then
        upgrade1 = upgrade1 + 1
        cake = cake - 10
        lblUpgrade.Text = "Upgraded"
    Else
        lblUpgrade.Text = "Not Enough Cakes"
    End If
End Sub

End Class