Refresh Detection (Asp.NET)

Know where I could get my hands on that refresh dection source code? Thanks, Darin

It's not full protection. 1. open page 2. duplicate it ( ctrl-n ) 3. press Button on first ( OK ) 4. press Button on second. "This page HAS been refreshed." message appears ( Bug ) Did you know any techique to prevent this behavior?

hi Nice code :)

hi,
Very good source.

your code is just great, it did help me .. thank you very much.

I understand your src code. but In the src code Refresh1 is defined and it is used in the binary file.
so please give me the proper source code.

Your code is great.
Thanks

My contact form now detects browser refresh to eliminate multiple submissions.
here hyper link on "contact form" is not working

There is a but with this code.  When you first come to this page, click on the "Clicke Me" button to so the button status is "..clicked 1 times".  

Now leave this page by using the navigation to the left (click on the cookie detection link).  Once one the cookie detection page, use the navigation again and click on the Refresh Dection link.  Notice that when you return back to Refresh Dection page, it thinks the page was refreshed.  

If this is not a bug, please let me know why this occurs.

I have 8 pages in my application. Starting from 2nd page I have your control on each page to detect page refresh. However when the user navigates from 1st page to 2nd page, the property IsRefreshed of control is set to TRUE from the start. Is this a bug?

Thank you.

Trying to install the Refresh control I encounter the following problem in VS2005 (working with VM ware):
1. SelectTools/Choose Toolbox Items menu
2. Select tab .NET Framework Components
3. browse and select Joel.Net.Refresh.dll yields error message:
"Invalid URI: The hostname could not be parsed". Why is this and what can I do to solve this?
The host name is: amsdc1-s-6133.europe.shell.com

Hey, I found a bug here. Copy this URL: http://joel.net/code/refresh_capture.aspx and then click on any other link and browse away from this page. Once you are in a different page, paste the above URL and it will say: The page HAS been refreshed. I have a similar problem, can't seem to get away with it.

Based on this example I have rewritten the code to work with ajax and can be used as a base page in the App_Code folder.


using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for DomPage
/// </summary>
public class DomPage : Page
{
    bool _isrefresh = false;
    string _tname = "__Ticket";

    /// <summary>Increments ticket and checks the last ticket served.  All the work is here.</summary>
    public DomPage()
    {
        this.PreInit += new EventHandler(DomPage_PreInit);
    }

    void DomPage_PreInit(object sender, EventArgs e)
    {
        // Change null to 0 (prevents errors)
        if (Session[_tname + "_LastServed"] == null || Request[_tname] == null) { Session[_tname + "_LastServed"] = 0; }
        // Get current and last ticket served
        int ticket = Convert.ToInt32(Request[_tname]) + 1;
        int lastticket = Convert.ToInt32(Session[_tname + "_LastServed"]);

        // Refresh detection
        if (ticket > lastticket || (ticket == 0 && lastticket == 0))
            Session[_tname + "_LastServed"] = ticket;
        else
            _isrefresh = true;
    }

    /// <summary>Outputs hidden field with ticket id.</summary>
    /// <param name="output">Html Text Writer</param>
    protected override void Render(HtmlTextWriter output)
    {
        //Checks if the page is using Ajax
        if (ScriptManager.GetCurrent(this) != null)
            ScriptManager.RegisterHiddenField(this, _tname, Session[_tname + "_LastServed"].ToString());
        else
            Page.ClientScript.RegisterHiddenField(_tname, Session[_tname + "_LastServed"].ToString());

        base.Render(output);
    }

    /// <summary>Returns true if page has been refreshed, otherwise false.</summary>
    public bool IsRefresh
    {
        get { return _isrefresh; }
    }
}

You may want to remove the html breaks.. The comment added those :)

Hi Joel,
How do I detect a new tab in Internet Explorer?
I have an ASP.NET page which hosts my application. I can detect a new session for a user through session_start in global.asax. I can detect a refresh though the server page_load event. But to detect a new tab, I have few possible options to try out:
1) identify HTTP_Connection ?
2) count the static objects in Session ?
3) Response.IsClientConnected ?
4) HTTP_REFERER ?
I don't know if any of these will do it. Please help!!
Thanks

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