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08.18.2008 at 06:34AM PDT, ID: 23656245
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8.2

Catching errors when connection to server is lost

Asked by Balltown in Programming for ASP.NET, C# Programming Language, Microsoft Visual C#.Net

Tags:

I'm using ASP.NET AJAX to show information on an info-screen. The application show a page for 5 seconds the switchs to another. When all pages has been shown the first page will be shown agian and so on...
The problem is if the connection to the server is lost the client machine will show a javascript alert-box with the text: "Sys.WebForms.PageRequestManagerTimeoutException: The server request timed out.". I know you could add "AsyncPostBackTimeout" to the ScriptManager like so...

<asp:ScriptManager ID="sm" runat="server" AsyncPostBackTimeout="180" />

... but I don't think this would solve the problem.

I tried simulating the error in 2 ways:
1) Renaming the database in Web.Config while the application was running. This works fine because I have a try...catch.
2) Stopping IIS while the application was running. This throws another error: "Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occured while processing the request on the server. The status code returned from the server was 12029"

Ofcause ASP.NET cannot work offline. Are there some way to catch the error - maybe though JavaScript? Like if it catches an error it should retry a minute late or so...

Theres a lot of code so here is the very basic...Start Free Trial 
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/// default.aspx ///
 
<asp:ScriptManager ID="ScriptManager1" runat="server" AsyncPostBackTimeout="180" />
 
<asp:Timer ID="Timer1" runat="server"></asp:Timer>
 
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Timer1" />   
    </Triggers>
    <ContentTemplate>
        <asp:Label ID="color_border" runat="server"></asp:Label>
        <div id="container" runat="server">
            <div style="background-color: transparent; position: absolute; z-index: 2;">
                <asp:Label ID="Heading" runat="server"></asp:Label>
                <asp:Label ID="Message" runat="server"></asp:Label>
            </div>
            <div id="trans" class="trans" runat="server"></div>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>
 
 
/// default.aspx.cs ////
protected void Timer1_Tick(object sender, EventArgs e)
{
    try
    {
        // Connection to DB.
        // Put stuff into labels here.
    }
    catch 
    {
        Timer1.Interval = 15000;
    }
}
[+][-]08.18.2008 at 06:49AM PDT, ID: 22251761

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[+][-]08.18.2008 at 06:58AM PDT, ID: 22251839

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[+][-]08.18.2008 at 11:58PM PDT, ID: 22257660

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About this solution

Zones: Programming for ASP.NET, C# Programming Language, Microsoft Visual C#.Net
Tags: ASP.NET, Visual C#
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Solution Provided By: Balltown
Participating Experts: 1
Solution Grade: A
 
 
 
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