how to block website for User not for All User

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I am using this code for blocking website. but it block website for all user. i want to block website for specific user not for all user.please suggest me how to do this. any links. suggestion etc.
I want to block website on system for user only not for all user. For example. There is two user in system e.g . Bob and Jimmy . i want to block "www.facebook.com for Bob. not for Jimmy. If Jimmy log in system he can access "www.facebook.com". but when Bob login he can not access. its a window application.......I am using the below code.but it block for all user

C#

String strpath = @"C:\Windows\System32\drivers\etc\hosts";
StreamWriter objstrWri = new StreamWriter(strpath , true);
String siteDtl= "\n 127.0.0.1 google.com";
objstrWri .Write(siteDtl);
objstrWri .Close();

Posted 12-Oct-12 0:24am

pradeep rasara

Updated 12-Oct-12 1:13am

v3

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Sushil Mate 12-Oct-12 6:59am

can u explain more.. where & what exactly you want to do it? i mean Windows application/Web Application..

pradeep rasara 12-Oct-12 7:05am

I want to block website on system for user only not for all user. For example. There is two user in system e.g . Bob and Jimmy . i want to block "www.facebook.com for Bob. not for Jimmy. If Jimmy log in system he can access "www.facebook.com". but when Bob login he can not access. its a window application.......

MT_ 12-Oct-12 7:55am

You should use firewall for such purposes

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Bernhard Hiller · Answer 1 · 2012-10-12T03:04:00

That's not at all a C# problem.

A possible solution is a proxy server, with user authentication. Then the proxy server can be configured in the desired way.

A simpler solution is a proxy configuration script, typically "proxy.pac". When the browser is configured to take that script from a user-specific location, you can get the desired effect.
The proxy.pac script looks something like

JavaScript

function FindProxyForURL(url, host)
{
    if (dnsDomainIs(host, ".facebook.com")) {
        return "PROXY 127.0.0.1:80";
    }
    else {
        return "DIRECT";
    }
}