When you start working and stop to do something else and then keep the web page open for hours on end.This lead to some ASP.NET Session has expired messages.To combat this you can add this code on your application is page
<!-- The folllowing loads a blank page that refreshes 60 seconds before the session timeout to keep session from expiring -->
<iframe id="ifrmBlank" frameborder="0" width="0" height="0" runat="server" src=""></iframe>
The Blank.aspx page should just be a blank page with the following code-behind code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
********************************************************
* Refresh this page 120 seconds before session timeout *
********************************************************
Response.AddHeader("Refresh", Convert.ToString((Session.Timeout * 60) - 120))
End Sub
Original Source:
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