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Guys,

How can I validate if website is already open.

I want to limit connection to my website per pc.
If my website is already open in the user's pc and try to open it again from another browser then I want to just focus to the currently open browser.


Thanks,

Hernan Cabrera
Posted

One choise is to register the visitors in a database SQLite or something simular. You could check the IP adress:
http://stackoverflow.com/questions/735350/how-to-get-a-users-client-ip-address-in-asp-net[^]

and/or the host name:
http://stackoverflow.com/questions/6160991/how-to-get-client-machine-name-in-asp-net-c-sharp[^]

Get the browser:
Detect the browser using ASP.NET and C#[^]

If those two dosnt work I dont really know what you should do. I dont really see what the point is though....

BTW: Mac Adress it more troublesome:
How to get Mac Address of Client Machine in asp.net[^]
 
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Hernan K. Cabrera 29-Aug-12 18:19pm    
Hi Kenneth,

I don't want my user to open my web page twice simultaneously in his pc that is why I want to detect if the web page is already open.
Hello,

Better approach is to create Cookies on clients, And check cookie every time. Refer following code snippet.



C#
public bool IsInstanceAlreadyExist()

{

 if (null == System.Web.HttpContext.Current.Request.Cookies["InstanceExist"])

{
 HttpCookie myCookie = new HttpCookie("InstanceExist")

 // Set the cookie value.
 myCookie.Value = "True";
 // Add the cookie.
 System.Web.HttpContext.Current.Response.Cookies.Add(myCookie);
 return false;
}
else
{
    return true;
}
}


And clear the cookie on Session to handle browser close issues.

C#
void Session_End(object sender, EventArgs e)
{
}


Thanks!!!!
 
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Hernan K. Cabrera 30-Aug-12 11:02am    
Hi Vinod,

What if session timeout reach? What should I do?

Thanks
Vinod Viswanath 1-Sep-12 10:23am    
Hi,

Create a base class and check for session is null or Session.IsNewSession then remove the cookie cariable

public class SessionCheck: System.Web.UI.Page
{
override protected void OnInit(EventArgs e)
{
base.OnInit(e);
if (Context.Session == null)
{
//remove cookies data
}


}
}


public partial class _Default : SessionCheck
{
//your code here
}

Hope you understood the scenario..

Thanks!!
Hi Kenneth and Vinod,

I've tried to use variable from global.asax and its working now.

for each user that login, I concatenate to a variable from global.asax but before
that I use instr to validate if the user is in the variable.

thanks to both of you.


Hernan Cabrera
 
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