Hello groupies,

I am doing a small web application, in this the user needs to get registered. During registartion , the password field should accept only alphanumeric values with minimum lenght 8, what exactly do I need to do for it  and What datatype do I need to use for it ? How can I set maximum and minimum lenght ?

Your reply is greatly appreciated..

Regards
MSB

You can consider using ASP.NET's built in validation control.  There are many posting on the internet on how to do this.

http://www.vkinfotek.com/validationcontrols.html

Hi Thanks for your reply..

I used two validation controls..

One is regualr expression for geting alpha numeric value  and

the other one is range validator to give maximum and minimum lenght

I gave maximum lenght as 15 and minimum lenght as 7..

when I debug I am getting an exception

Exception Details: System.Web.HttpException: The MaximumValue 15 cannot be less than the MinimumValue 7 of RVP.

Is there anything wrong with usage of Range validator ???

Regards

MSB

I have never used a range validator, and i don't think they can be used to validate the number of characters in a text field (i might be wrong about that though).   I would use a regex validator to determine text length, you can probably make a regex that validates the alphanumeric and the length properties with one validator.

Something like this

<asp:RegularExpressionValidator ID="Val1" runat="server" ValidationExpression="[a-zA-Z1-9]{7,15}" ControlToValidate="tb1" ErrorMessage="invalid" />

Hi I have used the regular expression for alphanumeric in whihc I have given lenght too..

[a-zA-Z0-9]*\w{6,15}

 Minimum 6 characters are being accepted but it is accepting  normal passwords like "classic" whihc is not alphanumeric.. I need

the textbox should take passwords like "Classic3"  , "14modern"

 Your reply is greatly apprecited ..

Regards

MSB

I never use both validation as well but I think sudheerbabum's solution should work fine.

Hi,

I want.. it should have definitely a number and a letter..

it should not accept if all the charaters are letters and all the characters are numbers..

Reagrds

MSB

Hello,
Thanks for your help.

Using this regular expression we can get an alpha numeric password

(?=^.{6,}$)(?=.*\d)(?=.*\W+)(?![.\n]).*$

for more information visit

http://en.csharp-online.net/ASP.NET_Security_Hacks%E2%80%94Validating_a_Strong_Password_in_Login_Controls

Regards
MSB