How to strenghten the password for a registration page and how to validate it in asp.net c#

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How to strenghten the password for a registration page and how to validate it in asp.net c#

I want some characters,numbers,Special characters,

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<td style="text-align: left; width: 90px;">
                                   Password
                               </td>
                               <td style="font-family: Verdana; font-size: medium; font-style: normal; text-align: left">
                                   <asp:TextBox ID="txtpassword" runat="server" Width="208px" ></asp:TextBox>
                                   <asp:RegularExpressionValidator ID="regpass" runat="server"
                                       ErrorMessage="RegularExpressionValidator" ControlToValidate="txtpassword"
                                       ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
                               </td>

Posted 2-Sep-12 19:37pm

Shibiny

Updated 2-Sep-12 21:17pm

v2

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Prasad_Kulkarni · Accepted Answer · 2012-09-02T19:45:00

Solution 1

Validating password with
-must be 8 characters including 1 uppercase letter, 1 special character & alphanumeric characters

(?=.*\d)        #   must contain at least one digit
(?=.*[A-Z])     #   must contain at least one uppercase character
(?=.*\W)        #   must contain at least one special symbol
   .            #   match anything with previous condition checking
{8,8}           #   length at least 8 characters and also maximum of 8

In one line:

((?=.*\d)(?=.*[A-Z])(?=.*\W).{8,8})

Sources:
* Password matching expression[^]
* Password Strength Validation with Regular Expressions[^]
* ASP.Net Regular Expression Validator to validate Minimum and Maximum Text Length[^]

Posted 2-Sep-12 19:45pm

Prasad_Kulkarni

Comments

Mohamed Mitwalli 3-Sep-12 2:21am

5+

Prasad_Kulkarni 3-Sep-12 2:32am

Thank you Mohamed!

Shibiny 3-Sep-12 2:31am

I Used your code like this:

<asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server"
ErrorMessage="RegularExpressionValidator" ControlToValidate="txtpassword"
ValidationExpression="((?=.*\d)(?=.*[A-Z])(?=.*\W).{8,8})">
It Worked fine,But data after error message,Entered data saved to database,how to prevent this

Prasad_Kulkarni 3-Sep-12 2:33am

Use retrun, if error occurs.

Shibiny 3-Sep-12 3:00am

How to do this

Shibiny 3-Sep-12 3:01am

add new event is not working after showing this error message

lukeer 3-Sep-12 3:12am

Show the relevant code snippet. Use the "Improve question" link for that (directly beneath your original question).

Shibiny 3-Sep-12 3:30am

How to use it in javascript

Manas Bhardwaj 3-Sep-12 6:07am

yup +5

Prasad_Kulkarni 3-Sep-12 6:13am

Thank you Manas!