IsNumeric Function

[MrMike]

Hi. I'm trying to create a simple validation process that only allows a user
to enter a numeric value into a textbox. However, my process does not work
and the user can still enter non-numeric values. My code is below. How can
I fix this? Thanks.

If Not (IsNumeric(CType(e.Item.Cells(3).Controls(0), TextBox).Text)) Then
Me.lblErrorMsg.Text = "Only numeric values allowed!"
Exit Sub
End If

[Dan Bass]

Mike,

A suggestion would be to scrap this code behind and go with client side
validation. What you're doing isn't wrong, but it does mean a post-back has
to a occur before the user will see their error. It's better to have a
CompareValidator that contains your text error string, where the operator =
"DataTypeCheck" and the Type is "Integer"...

This will only allow a postback if the value in the textbox is an integer.

Google on CompareValidator for more, or let me know if you need more help.

Daniel.
"MrMike" <Mr****@discussions.microsoft.com> wrote in message
news:3C**********************************@microsof t.com...

Hi. I'm trying to create a simple validation process that only allows a
user
to enter a numeric value into a textbox. However, my process does not
work
and the user can still enter non-numeric values. My code is below. How
can
I fix this? Thanks.

If Not (IsNumeric(CType(e.Item.Cells(3).Controls(0), TextBox).Text)) Then
Me.lblErrorMsg.Text = "Only numeric values allowed!"
Exit Sub
End If

[Hans Kesting]

MrMike wrote:

Hi. I'm trying to create a simple validation process that only
allows a user to enter a numeric value into a textbox. However, my
process does not work and the user can still enter non-numeric
values. My code is below. How can I fix this? Thanks.

If Not (IsNumeric(CType(e.Item.Cells(3).Controls(0), TextBox).Text))
Then Me.lblErrorMsg.Text = "Only numeric values allowed!"
Exit Sub
End If

Use a "CompareValidator", with type set to integer and operator
set to datatypecheck. Don't forget the "ControlToValidate" :-)
Hans Kesting

[Tampa .NET Koder]

Mike,
Remember, even though you wrote this code:
Me.lblErrorMsg.Text = "Only numeric values allowed!"

You still don't through an exception, therefore this will still cause the
form to post its values. Like the others explained, use the asp.net
validation controls to stop users from entering bad values

"MrMike" wrote:

Hi. I'm trying to create a simple validation process that only allows a user
to enter a numeric value into a textbox. However, my process does not work
and the user can still enter non-numeric values. My code is below. How can
I fix this? Thanks.

If Not (IsNumeric(CType(e.Item.Cells(3).Controls(0), TextBox).Text)) Then
Me.lblErrorMsg.Text = "Only numeric values allowed!"
Exit Sub
End If

[MrMike]

Thank you all for your posts. I've successfully implemented a
comparevalidator as suggested. I'm still making the transition from Access
VBA to VB.NET :)

Thanks!

"Tampa .NET Koder" wrote:

Mike,
Remember, even though you wrote this code:
Me.lblErrorMsg.Text = "Only numeric values allowed!"

You still don't through an exception, therefore this will still cause the
form to post its values. Like the others explained, use the asp.net
validation controls to stop users from entering bad values

"MrMike" wrote:

Hi. I'm trying to create a simple validation process that only allows a user
to enter a numeric value into a textbox. However, my process does not work
and the user can still enter non-numeric values. My code is below. How can
I fix this? Thanks.

If Not (IsNumeric(CType(e.Item.Cells(3).Controls(0), TextBox).Text)) Then
Me.lblErrorMsg.Text = "Only numeric values allowed!"
Exit Sub
End If

[Dan Bass]

Thank you all for your posts. I've successfully implemented a
comparevalidator as suggested. I'm still making the transition from
Access
VBA to VB.NET :)

Good to ask questions, even better to listen to the answers. Looking at the
guys around these parts, I realise I know's nothing!