Change Textbox Value automatically upon data entered

Hi all,

I have the following code that places the values from text boxes in a excel form, but it doesn't automatically change unless I click inside the textbox itself, is there a way for it to automatically change depending on the data entered?

Private Sub FinalDonations_Change()
FinalDonations.Text = Val(Donation.Text) + Val(TotalTextBox.Text)
End Sub

Thanks in advance.