regular expression validation in asp.net

Question

i am using Regular expression validator c# in asp.net for a login page..i have different login pages for student,lecturer and admin..the login ids are of the form 1RNxxCSxxx,1RNLECSxxx,1RNADCSxxx respectively(x-digits) my problem is it validates the text box and displays the error message.. but it still continues n logs in..my code is..

    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"       ControlToValidate="TextBox1" ErrorMessage="Enter in 1RNxxCSxxx format" ValidationExpression="[1][R][N][0-9][0-9][C][S][0-9][0-9][0-9]"></asp:RegularExpressionValidator>

ie..if i type lecturer id in student login page i can still login inspite of gettin error message..any help would be appreciated.thank u

Can you post the validation code.

nerdybeardo
– nerdybeardo

2013-04-25 15:00:59 +00:00
Commented Apr 25, 2013 at 15:00 — nerdybeardo
– nerdybeardo, Commented Apr 25, 2013 at 15:00

Community · Accepted Answer · 2017-05-23 12:14:07Z

1

It seems from the name of your textbox that you're using custom login logic. I would suggest you look into using a membership provider which will be more robust in securing your entire application. Check out How to configure member ship with a database other than aspnetdb

For your immediate problem though in the method that logs the user in check if the page is valid.

if( !Page.IsValid )
{
     return;
}

More information can be found here: this link

Also your regular expression is incorrect. Use the following for a successful match.

^1RN([0-9]{2}|LE|AD)CS[0-9]{3}$

The expression above says that the string should start (^ signifies a start) with 1RN have two digits or LE or AD followed by the letters CS and three digits ($ signifies end).

edited May 23, 2017 at 12:14

CommunityBot

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answered Apr 25, 2013 at 10:43

nerdybeardo

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3 Comments

user2319241 Over a year ago

thank you for the reply..i have used membership stuff..only members can login..but the problem exists among members itself..i changed my regular expression..it is still not working.. in the code behind to validate the id and password i have given if (RegularExpressionValidator1.IsValid == true) { conditions check.. } and this value is always getting stored as true..so it is logging in

user2319241 Over a year ago

if (pswd == valid){ String q2 = "select ANO from USERS where ID='" + usn +"';"; SqlCommand myc2 = new SqlCommand(q2, con); SqlDataReader myd2; myd2 = myc2.ExecuteReader(); myd2.Read(); a = myd2[0].ToString(); myd2.Close(); Session["usn"] = usn; Session["ANO"] = a; Response.Redirect("SHome.aspx"); } else{ string script = "<script type=\"text/javascript\">alert('invalid ID or Password..Try again!');</script>"; ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert", script); } }

nerdybeardo Over a year ago

Dude you should delete this comment you have your password in the code you posted.

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