Data Type validation in textbox - vb.net

Question

Trying to make a validation where only letters can be entered into a textbox. I've got that part working, but I would also like the ability for the user to use the backspace button, and I'm not sure how
Private Sub TxtBoxCustForename_KeyPress(sender As Object, e As KeyPressEventArgs) Handles TxtBoxCustForename.KeyPress
If Asc(e.KeyChar) < 65 Or Asc(e.KeyChar) > 122 Then 'Ensures only letters can be entered by using the ASCII converter'
e.Handled = True
MessageBox.Show("You may only input letters")
End If
End Sub

Answer 1

Input validation is a built-in feature of .NET. You don't need to capture key presses and manually code your own solution.
You might want to use a MaskedTextBox as suggested in this article:
https://learn.microsoft.com/en-us/dotnet/framework/winforms/user-input-validation-in-windows-forms

Answer 2

You can change your If statement like this:
If (Asc(e.KeyChar) < 65 Or Asc(e.KeyChar) > 122) And Asc(e.KeyChar) <> 8 Then
Ascii 8 is the Backspace key.

Answer 3

Rather than using the KeyPress event, use the TextChanged event. Also, I would recommend using the IsNumeric function to test whether it is a number or not.
Private Sub TxtBoxCustForename_KeyPress(sender As Object, e As EventArgs) Handles TxtBoxCustForename.TextChanged
For Each entry as Char in TxtBoxCustForename.Text
If IsNumeric(entry) Then
MessageBox.Show("You may only input letters")
Exit For
End If
Next
End Sub

Answer 4

If you're going to use .NET then use .NET.
Private Sub TxtBoxCustForename_KeyPress(sender As Object, e As KeyPressEventArgs) Handles TxtBoxCustForename.KeyPress
Dim keyChar = e.KeyChar
If Not Char.IsLetter(keyChar) AndAlso Not Char.IsControl(keyChar) Then
e.Handled = True
MessageBox.Show("You may only input letters")
End If
End Sub
This still doesn;t prevent the user pasting invalid text into the control though, so you still need to handle the Validating event or use a custom control that catches paste operations.