Help with some Beginner Code? - Small problem with entering text.

Hey VBForums. Hoping you guys can help me out with solving a small problem I have.

Code:

---

Private Sub GuessTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GuessTextBox.TextChanged
        If Not IsNumeric(GuessTextBox.Text) Then
            GuessTextBox.Text = ""
            MsgBox("Hey! Letters don't count. Only numbers")
        End If
        If IsNumeric(GuessTextBox.Text) > 1000 Then
            GuessTextBox.Text = "1000"
        End If
    End Sub

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I have this here, i'm making a simple 'Guess the Number' Kid's game.
If the user enters a non Integer number in the 'GuessTextBox' it will give them that message and erase the number in the box.

Every time the space becomes blank however the message prompts.

So if I type 125 then backspace it, it will give the message. How do I make it so this message only prompts when something non-numeric is placed in?

OR Is there a way I can make it so it simply doesn't allow anything but 1,2,3,4,5,6,7,8,9,0 in the box?

Thanks.

vb.net Code:

Public Class Form1
 
    Private Sub GuessTextBox_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles GuessTextBox.KeyDown
        If e.KeyCode = Keys.Back Then Exit Sub
    End Sub
 
    Private Sub GuessTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GuessTextBox.TextChanged
        If Not IsNumeric(GuessTextBox.Text) Then
            GuessTextBox.Text = ""
            MsgBox("Hey! Letters don't count. Only numbers")
            Exit Sub
        End If
        If IsNumeric(GuessTextBox.Text) > 1000 Then
            GuessTextBox.Text = "1000"
        End If
    End Sub
End Class

There are a few ways to do what you want. If you want to check it before you process the data then perform an 'IsNumeric()' check on the textbox data. If you wish to check it as you go, lookup the KeyPress event.

Code:

---

Private Sub Command1_Click()
    If IsNumeric(Text1.text) = False then
        MsgBox "Please Enter Numeric Data Only!"
        Exit Sub
    End If
End Sub

OR:

Private Sub Text1_KeyPress(KeyAscii as Integer)
    ' If less than 0 or > 9 then ignore
    If KeyAscii < &H30 or KeyAscii > &H39 then
        KeyAscii = 0
    End If
End Sub

OR:

Private Sub Text1_KeyPress(KeyAscii As Integer)
  'Numeric only:
  KeyAscii = Asc(UCase(Chr$(KeyAscii)))
    Select Case KeyAscii
      Case 0 To 32
      Case 48 To 57
      Case Else
          KeyAscii = 0
    End Select
End Sub

OR:
 
Private Sub Text1_KeyPress(KeyAscii As Integer)
  'Non-numeric only:
  Select Case KeyAscii
      Case 0 To 32
      Case 65 To 90
      Case Else
        KeyAscii = 0
  End Select
End Sub

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jemmer, the OP is using VB.NET not VB6! I have requested the thread moved.

Yeh, realised that after posting and couldn't delete it...my bad :)

Thread moved from the 'VB6 and Earlier' (aka VB 1998 and earlier) forum to the 'VB.Net' (VB2002 and later) forum