Making VBA Form TextBox accept Numbers only (including +, - and .)

Question

I have simple textBox and I want to validate its input including \"+\" , \"-\" and \".\" here is what I have tried

Private Sub DisplayValue_TextBox_Change()         


        

Answer 1

Im using that:

Private Sub txtGiaNet_Change()
    If IsNumeric(txtGiaNet.Value) Then
        //if number do sth
    Else
        //if not, delete this character
        txtGiaNet.Value = Left(txtGiaNet.Value, Len(txtGiaNet.Value) - 1)
    End If

End Sub