how to prevent users to login twice ?

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SQL-Server-2008

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hello;
I have made an online internet survey in my departement with asp.net 4.0.
in this form there is no login page for users, so the first problem my i face to is the loging of same users.

how can i prevent the same users to be able contribute in the survey twice?

Note: iam working in an institute that all PC are connected in network.

is there any solution for that?

Posted 20-Jul-13 22:07pm

mohammad ehsan

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**Joezer BH** · Answer 1 · 2013-07-20T22:26:00

What you can do is keep a list of Active Directory Users that has already filled the form and every time a user fills the form or access the page (you decide) you can validate against the list you are holding, and allow/deny actions accordingly.

To get the user's identity, you can try:

C#

Request.LogonUserIdentity.User

See more on LogonUserIdentity: system.web.httprequest.logonuseridentity.aspx[^]

Good luck,
Edo

ridoy · Answer 2 · 2013-07-21T00:29:00

I think Session is a good option to do that.See..
http://stackoverflow.com/questions/4279262/what-is-the-simplest-way-to-block-users-to-log-on-to-a-webapplication-twice[^]
how to restrict user login twice in asp.net[^]
http://dotnet.learningtree.com/2011/07/11/preventing-duplicate-logins-in-asp-net/[^]
http://www.dotnetfunda.com/articles/article1083-restricting-user-to-login-multiple-times-using-same-credentials.aspx[^]

how to prevent users to login twice ?

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