Editing existing key press event in visual basic - vb.net

Question

This is a small piece of code for a project I'm working on for my study.
We have to make a program in Visual Basic (with Visual Studio 2015) that copies text from the first text box and pastes it into the second one once you press the button that states: "Show Name".
We are meant to handle it so that if the value entered is between 'A' to 'Z' then it copies the text and pastes it normally once you press the button into the second text box.
We are also supposed to make it so that, if the value is a number (between 0 and 9) we are meant to have a message which pops up saying something like: "Error - You Entered a Number".
We are also supposed to make a box that pops up saying: "Error - You Entered Something Other Than a Number", if the value is a character other than a letter or a number. I am in kind of a rush and would appreciate any help soon.
Here is my code so far. (I know Keys.A and Keys.Z and the message box is wrong, which I need to fix, too):
Public Class MyFirstProgram
Private Sub DisplayTextButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DisplayTextButton.Click
ShowTextBox.Text = EnterTextBox.Text
End Sub
Private Sub me_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
Dim letterEntered As Char
If e.KeyCode < Keys.A Or e.KeyCode > Keys.Z Then
MsgBox("Error - Use letter keys only!", MsgBoxStyle.OkOnly, )
Else
letterEntered = LCase(ChrW(e.KeyCode))
If ShowTextBox.Text = "" Then
ShowTextBox.Text = letterEntered
Else
ShowTextBox.Text = ShowTextBox.Text + letterEntered
End If
End If
End Sub
Private Sub ClearButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ClearButton.Click
EnterTextBox.Text = ""
End Sub
Private Sub MyFirstProgram_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.KeyPreview = True
End Sub
End Class
Oh, and I'm new to Visual Basic/programming; so, please try to be patient if you can. Sorry :/

Answer 1

Use KeyPress press event .. instead of keyDown
Private Sub me_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
'If e.KeyCode < Keys.A Or e.KeyCode > Keys.Z Then
' MsgBox("Error - Use letter keys only!", MsgBoxStyle.OkOnly, )
'Else
' Dim letterEntered = LCase(ChrW(e.KeyCode))
' ShowTextBox.Text = ShowTextBox.Text + letterEntered
'End If
'e.Handled = True
End Sub
Private Sub Form1_KeyPress(sender As Object, e As KeyPressEventArgs) Handles Me.KeyPress
If Not Char.IsLetter(e.KeyChar) Then
MsgBox("Error - Use letter keys only!", MsgBoxStyle.OkOnly)
e.Handled = True
End If
End Sub

Answer 2

just look in to the IsNumeric Function if it could help you.