How to make a texbox numeric only or text only VB.net : Dear Stackoverflow people,

It's my first time asking a question here, but i also try to help other people as good as possible. But now lets get to the question. I've a form with 3 textboxes and 2 buttons. Button 1 is enabled if all 3 textboxes are filled in. Button 2 is a quit program button. Let's see my code for the textboxes 

    
    Private Sub TextBoxes_TextChanged(
        ByVal sender As System.Object, ByVal e As System.EventArgs) _
        Handles _
            TextBox1.TextChanged,
            TextBox2.TextChanged,
            TextBox3.TextChanged

        Dim textBoxes = {TextBox1, TextBox2, TextBox3}
        Button1.Enabled = textBoxes.All(Function(tb) tb.Text <> "")
    End Sub

So now i am wondering how can i change the value of textbox 2 to only numerics and of textbox 1 and 3 to only text. I hope you'll understand my questions. I hope you guys can help me out.

Kindly regards,
Slamnose