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Way to only allow numbers in a text box?

 
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cildor666
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PostPosted: Wed Sep 24, 2008 10:31 am    Post subject: Way to only allow numbers in a text box? Reply with quote
I'm using Visual Basic 2008 Express.

Is there a way to only allow numbers in a text box, so if i click a button it pops up saying 'Not numeric!" when there is text typed into the box.

Thanks for any help.
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Stylo
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PostPosted: Wed Sep 24, 2008 11:15 am    Post subject: Reply with quote
you can start a timer / thread and set it to 1 (ms) and check if one of the chars in the text field isn't numberic
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HolyBlah
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PostPosted: Wed Sep 24, 2008 11:29 am    Post subject: Reply with quote
1qaz wrote:
you can start a timer / thread and set it to 1 (ms) and check if one of the chars in the text field isn't numberic
Or, put a the check in the TextChanged event.
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Stylo
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PostPosted: Wed Sep 24, 2008 11:44 am    Post subject: Reply with quote
HolyBlah wrote:
1qaz wrote:
you can start a timer / thread and set it to 1 (ms) and check if one of the chars in the text field isn't numberic
Or, put a the check in the TextChanged event.

much better Cool
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cildor666
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PostPosted: Wed Sep 24, 2008 12:06 pm    Post subject: Reply with quote
Thanks for the help guys but i figured out a different way.

Code:
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress

    Dim allowedChars As String = "0123456789"

    If allowedChars.IndexOf(e.KeyChar) = -1 Then
        MsgBox("Only numbers are allowed.", MsgBoxStyle.Information)
        e.Handled = True
    End If


Is there any way to allow backspace in the 'Dim allowedChars As String = "0123456789" ??
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Heartless
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PostPosted: Wed Sep 24, 2008 3:30 pm    Post subject: Reply with quote
Code:
Private Sub Text1_Change()
If IsNumeric(Text1.Text) = False Then

    MsgBox "Numbers only"
End If
End Sub

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