int.TryParse

[ats@jbex]

I have a textbox on a web page that I want users to be able to enter a
credit/debit card issue number if there is one. These numbers sometimes use
a leading zero. If I use the int.TryParse function to ensure there are no
alpha characters will it return false if the number is for instance 01 or
02?

TIA
--
ats@jbex

When an old lady got hit by a truck
I saw the wicked gleam in your eyes

Adam and The Ants - Whip In My Valise

 

[Bill McCarthy]

Hi,

I have a textbox on a web page that I want users to be able to enter a
credit/debit card issue number if there is one. These numbers
sometimes use a leading zero. If I use the int.TryParse function to
ensure there are no alpha characters will it return false if the
number is for instance 01 or 02?

There's a couple of options. You can use Cint or IsNumeric but they both
allow hex notation. IF you are using VB 2008 I would use this:

If Textbox1.Text.All(Function(c) Char.IsDigit(c)) Then

 

[rowe_newsgroups]

I have a textbox on a web page that I want users to be able to enter a
credit/debit card issue number if there is one. These numbers sometimes use
a leading zero. If I use the int.TryParse function to ensure there are no
alpha characters will it return false if the number is for instance 01 or
02?

TIA
--
ats@jbex

When an old lady got hit by a truck
I saw the wicked gleam in your eyes

Adam and The Ants - Whip In My Valise

I would highly recommend you add one of the ASP.NET validation
controls to the page to do some initial client-side checking. One
strategy would be to use a Regex Validator to parse the input format,
ensuring there are no alphabetic character or that the credit card
number is in a valid format (xxxx-xxxx-xxxx-xxxx).

As always, I highly recommend a product called Expresso for creating
Regex expressions, it's free to use and can save you tons of time:

http://www.ultrapico.com/Expresso.htm

Thanks,

Seth Rowe [MVP]
http://sethrowe.blogspot.com/

 

[Göran Andersson]

I have a textbox on a web page that I want users to be able to enter a
credit/debit card issue number if there is one. These numbers sometimes use
a leading zero. If I use the int.TryParse function to ensure there are no
alpha characters will it return false if the number is for instance 01 or
02?

TIA

No. "01" or "02" will parse into integers without problems.

 

[Gillard]

have a look there
http://en.wikipedia.org/wiki/Credit_card_numbers

http://en.wikipedia.org/wiki/ISO_7812

http://en.wikipedia.org/wiki/Luhn_algorithm

 

[Scott M.]

If I use the int.TryParse function to ensure there are no
alpha characters will it return false if the number is for instance 01 or
02?

I know one easy way to find out.

 

[Cor Ligthert[MVP]]

Seth,

I thought it was Google

http://javascript.internet.com/forms/val-credit-card.html



Cor

"rowe_newsgroups" <[email protected]> schreef in bericht

I have a textbox on a web page that I want users to be able to enter a
credit/debit card issue number if there is one. These numbers sometimes
use
a leading zero. If I use the int.TryParse function to ensure there are no
alpha characters will it return false if the number is for instance 01 or
02?

TIA
--
ats@jbex

When an old lady got hit by a truck
I saw the wicked gleam in your eyes

Adam and The Ants - Whip In My Valise

I would highly recommend you add one of the ASP.NET validation
controls to the page to do some initial client-side checking. One
strategy would be to use a Regex Validator to parse the input format,
ensuring there are no alphabetic character or that the credit card
number is in a valid format (xxxx-xxxx-xxxx-xxxx).

As always, I highly recommend a product called Expresso for creating
Regex expressions, it's free to use and can save you tons of time:

http://www.ultrapico.com/Expresso.htm

Thanks,

Seth Rowe [MVP]
http://sethrowe.blogspot.com/

 

[ats@jbex]

Hi,



There's a couple of options. You can use Cint or IsNumeric but they both
allow hex notation. IF you are using VB 2008 I would use this:

If Textbox1.Text.All(Function(c) Char.IsDigit(c)) Then

Thanks I will give it a go.
--
ats@jbex

Those who died are justified, for wearing the badge, they're the chosen
whites
You justify those that died by wearing the badge, they're the chosen whites

Rage Against The Machine - Killing In The Name

 

[ats@jbex]

I would highly recommend you add one of the ASP.NET validation
controls to the page to do some initial client-side checking. One
strategy would be to use a Regex Validator to parse the input format,
ensuring there are no alphabetic character or that the credit card
number is in a valid format (xxxx-xxxx-xxxx-xxxx).

As always, I highly recommend a product called Expresso for creating
Regex expressions, it's free to use and can save you tons of time:

http://www.ultrapico.com/Expresso.htm

Thanks,

Seth Rowe [MVP]
http://sethrowe.blogspot.com/

Thanks for this.
--
ats@jbex

Every year is the same
And I feel it again,
I'm a loser - no chance to win

The Who - I'm One

 

[ats@jbex]

have a look there
http://en.wikipedia.org/wiki/Credit_card_numbers

http://en.wikipedia.org/wiki/ISO_7812

http://en.wikipedia.org/wiki/Luhn_algorithm

Thanks
--
ats@jbex

The world is my expense
The cost of my desire
Jesus blessed me with its future
And I protect it with fire

Rage Against The Machine - Sleep Now In The Fire