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Private Sub Text1_KeyPress(KeyAscii As Integer)
    Select Case Chr(KeyAscii)
    Case "0" To "9" 'Numbers
    Case "a" To "z" 'Lower case
    Case "A" To "Z" 'Upper case
    Case " ", Chr(8) 'Space or delete keys
    Case Else 'Not a valid key so set the keyascii = 0 to ignore the keypress
        KeyAscii = 0
    End Select
End Sub

Actually this does the validation as the key is pressed so that you can be sure that it will always include only alphanumeric characters and spaces.

TimCottee,

What happens if the user pastes characters into the textbox?

Good point though as Ctrl+V is disabled it would have to be done on the context menu and this could be disabled using the mousedown event.


Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = 2 Then
        MsgBox "Ha Ha"
    End If
End Sub

Option Explicit

Private Declare Function IsCharAlphaNumeric Lib "user32" Alias "IsCharAlphaNumericA" (ByVal cChar As Byte) As Long

Private Sub Text1_Change()
Dim c As Long
Dim sTest

Dim k

k = Text1.SelStart



For c = 1 To Len(Text1.Text)
    If IsCharAlphaNumeric(Asc(Mid(Text1, c, 1))) = 1 Then
        sTest = sTest & Mid(Text1, c, 1)
    End If
Next

If Len(sTest) <> Len(Text1.Text) Then
    Text1 = sTest
    Text1.SelStart = k
End If



End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)
If Not (IsCharAlphaNumeric(KeyAscii) <> 0 Or KeyAscii = vbKeyBack) Then
 KeyAscii = 0
End If
End Sub

Option Explicit

Private Declare Function IsCharAlphaNumeric _
Lib "user32" Alias "IsCharAlphaNumericA" (ByVal cChar As Byte) As Long

Private Sub Text1_Change()
Dim c As Long
Dim sTest

Dim k

k = Text1.SelStart



For c = 1 To Len(Text1.Text)
    If IsCharAlphaNumeric(Asc(Mid(Text1, c, 1))) = 1 Then
        sTest = sTest & Mid(Text1, c, 1)
    End If
Next

If Len(sTest) <> Len(Text1.Text) Then
    Text1 = sTest
    Text1.SelStart = k
End If



End Sub

Private Sub Text1_KeyPress(KeyAscii As Integer)
If Not (IsCharAlphaNumeric(KeyAscii) <> 0 Or KeyAscii = vbKeyBack) Then
 KeyAscii = 0
End If
End Sub

Of course, there is a VBA alternative to IsCharAlphaNumeric API.  You only need extra validation if you allow the user to paste into the textbox.

strTemp = Text1.Text
for i=1 to len(strTemp)
  if mid$(strTemp,i,1) like "[A-Z,a-z,0-9]"
next

Also, if you don't want to allow spaces into the textbox, you will need to modify TimCottee's fourth Case clause.

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