one decimal point in text box

20 Aug 2006 8:39 PM

trawlerman

Hi all,
C# newbie after migrating from VB. I wish to have only valid numbers
entered into a txtbox . i.e only one decimal point.

///////////////////My VB code for this is:
Private Sub txtGcost_KeyPress(KeyAscii As Integer)
    Select Case KeyAscii
    Case 48 To 57, 8
     Case 46
     If InStr(txtGcost.Text, ".") > 0 Then
        'Decimal point already there.
        KeyAscii = 0
         If Left(txtGcost.Text, 1) = "." Then
          txtGcost = "0."
        End If
    End If
    Case Else
    KeyAscii = 0
End Select
End Sub

///////////////My C# code is:

private void txtCost_KeyPress(object sender, KeyPressEventArgs e)
        {
            {
                const char Delete = (char)8;
                const char dot = (char)46;
                string check4dot = ".";
                string searchstring = txtCost.Text;
                int checkit = searchstring.IndexOf(check4dot);

                if (checkit >1 )

                    {

                    e.Handled = !Char.IsDigit(e.KeyChar) && e.KeyChar
!= Delete && e.KeyChar != dot;

Which works fine, except for not allowing no more than one decimal
point,

Thank in advance

21 Aug 2006 7:06 AM

Stefan Schelling

Hi Trawlerman

Why don't you validate with a RegularExpression if the text in your Textbox
is valid?

Stefan Schelling
Show quote

"trawlerman" <colinwilliams***@msn.com> schrieb im Newsbeitrag
news:1156106384.949186.119750@p79g2000cwp.googlegroups.com...
> Hi all,
> C# newbie after migrating from VB. I wish to have only valid numbers
> entered into a txtbox . i.e only one decimal point.
>
> ///////////////////My VB code for this is:
> Private Sub txtGcost_KeyPress(KeyAscii As Integer)
>    Select Case KeyAscii
>    Case 48 To 57, 8
>     Case 46
>     If InStr(txtGcost.Text, ".") > 0 Then
>        'Decimal point already there.
>        KeyAscii = 0
>         If Left(txtGcost.Text, 1) = "." Then
>          txtGcost = "0."
>        End If
>    End If
>    Case Else
>    KeyAscii = 0
> End Select
> End Sub
>
>
> ///////////////My C# code is:
>
>
> private void txtCost_KeyPress(object sender, KeyPressEventArgs e)
>        {
>            {
>                const char Delete = (char)8;
>                const char dot = (char)46;
>                string check4dot = ".";
>                string searchstring = txtCost.Text;
>                int checkit = searchstring.IndexOf(check4dot);
>
>
>                if (checkit >1 )
>
>
>                    {
>
>
>                    e.Handled = !Char.IsDigit(e.KeyChar) && e.KeyChar
> != Delete && e.KeyChar != dot;
>
>
> Which works fine, except for not allowing no more than one decimal
> point,
>
>
> Thank in advance
>

21 Aug 2006 12:16 PM

trawlerman

Stefan Schelling wrote:
Hi Stefan
Yes i think that would be a more logical approach. Let them type in
what they want and then catch an exception at event time.
Thanks

Show quote

> Hi Trawlerman
>
> Why don't you validate with a RegularExpression if the text in your Textbox
> is valid?
>
> Stefan Schelling
> "trawlerman" <colinwilliams***@msn.com> schrieb im Newsbeitrag
> news:1156106384.949186.119750@p79g2000cwp.googlegroups.com...
> > Hi all,
> > C# newbie after migrating from VB. I wish to have only valid numbers
> > entered into a txtbox . i.e only one decimal point.
> >
> > ///////////////////My VB code for this is:
> > Private Sub txtGcost_KeyPress(KeyAscii As Integer)
> >    Select Case KeyAscii
> >    Case 48 To 57, 8
> >     Case 46
> >     If InStr(txtGcost.Text, ".") > 0 Then
> >        'Decimal point already there.
> >        KeyAscii = 0
> >         If Left(txtGcost.Text, 1) = "." Then
> >          txtGcost = "0."
> >        End If
> >    End If
> >    Case Else
> >    KeyAscii = 0
> > End Select
> > End Sub
> >
> >
> > ///////////////My C# code is:
> >
> >
> > private void txtCost_KeyPress(object sender, KeyPressEventArgs e)
> >        {
> >            {
> >                const char Delete = (char)8;
> >                const char dot = (char)46;
> >                string check4dot = ".";
> >                string searchstring = txtCost.Text;
> >                int checkit = searchstring.IndexOf(check4dot);
> >
> >
> >                if (checkit >1 )
> >
> >
> >                    {
> >
> >
> >                    e.Handled = !Char.IsDigit(e.KeyChar) && e.KeyChar
> > != Delete && e.KeyChar != dot;
> >
> >
> > Which works fine, except for not allowing no more than one decimal
> > point,
> >
> >
> > Thank in advance
> >