Keypress event

[Kay]

Hi all,

I created a function to limit only number(dot/del etc are ok) can be entered
into a text box. If an invalid character is entered I simply want to cancel
what is entered - this part works but, if a VALID character is entered it
produce "Specified cast is not valid"... can you tell why? Here's my code:
Function OnlyNumber(ByRef e As System.Windows.Forms.KeyPressEventArgs)
As Boolean
Dim iAsc As Integer

e.Handled = False
iAsc = Asc(e.KeyChar)

Select Case iAsc
Case 8
'user press backspace, do nothing
Case 127
'user press del, do nothing
Case 48 To 57
'valid key, do nothing from 0-9
Case 44
'valid key, comma
Case 46
'valid key, dot
Case Else
'other invalid key
OnlyNumber = True
End Select


End Function
<<<<<<<

Thanks!

Kay

 

[Kay]

Hi all,

I found the problem now which is not directly caused by the function, indeed
it has conflict with the text changed event...

Thanks for your time to read my post!!

 

[Cor Ligthert [MVP]]

Kay,

Try for this kind of functions the KeyUp event, it gives you much more
information.

Cor

 

[Kay]

Oh!!! Cool Cor, thanks!

Hi all,

I created a function to limit only number(dot/del etc are ok) can be
entered into a text box. If an invalid character is entered I simply want
to cancel what is entered - this part works but, if a VALID character is
entered it produce "Specified cast is not valid"... can you tell why?
Here's my code:

Function OnlyNumber(ByRef e As System.Windows.Forms.KeyPressEventArgs)
As Boolean
Dim iAsc As Integer

e.Handled = False
iAsc = Asc(e.KeyChar)

Select Case iAsc
Case 8
'user press backspace, do nothing
Case 127
'user press del, do nothing
Case 48 To 57
'valid key, do nothing from 0-9
Case 44
'valid key, comma
Case 46
'valid key, dot
Case Else
'other invalid key
OnlyNumber = True
End Select


End Function
<<<<<<<

Thanks!

Kay