[Year 12 SofDev] help

[Michael Wooldridge]

Hi guys,

 

I need help. Trying to write validation code that limits a text box entry to
numerical and one decimal place only (and only two decimal places after the
point, as in cash). The following code works fine except that it allows me
to enter letters. The problem seems to be this line: If Not
Char.IsDigit(e.KeyChar) Then 'if not a digit

To me, initially, I would have thought it should read: If Not
e.KeyChar.IsDigit(e.KeyChar) Then 'if not a digit but VB won't let me do
that and keeps telling me to change it back to "Char" 

 

 

I can't figure out why! Strangely, if a number is entered in the text box
first, then I try to type over it with letters, it works perfectly. 

 

If anyone can solve this for me or has a better way of doing it your
suggestions would be much appreciated.

 

 

    Private Sub TextBox2_KeyPress(ByVal sender As Object, ByVal e As
System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress

 

        If Not Char.IsDigit(e.KeyChar) Then 'if not a digit

            If Not Asc(e.KeyChar) = 8 Then 'and not a backspace

                If Not TextBox2.Text.LastIndexOf(Chr(46)) = -1 Then 'and a
decimal has already been added, dont allow

                    e.Handled = True

                    MsgBox("numbers only")

                End If

            End If

        Else 'if a digit compare index of decimal point (if it exists) and
length of text

            If Not TextBox2.Text.LastIndexOf(Chr(46)) = -1 Then

                If TextBox2.TextLength > TextBox2.Text.LastIndexOf(Chr(46))
+ 2 Then

                    'if length is over 2 spaces from the decimal point, dont
allow 

                    e.Handled = True

                    MsgBox("only two decimal places allowed")

                End If

            End If

 

        End If

 

    End Sub

 

 

Description: signiture

 

"It is the tragedy of the world that no one knows what he doesn't know - and
the less a man knows, the more sure he is that he knows everything" Joyce
Cary.

 

Michael Wooldridge

Information Technology Coordinator

Mornington Secondary College

1051 Nepean Highway, Mornington 3931

(: 03 59700250 6: 03 59700299

 <mailto:mwo at mornsc.vic.edu.au> mwo at mornsc.vic.edu.au

 

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Development. There, that just about covers everyone's arse but yours, sorry.

 

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