What is causing the script blocks to exponentially increase in size within the VS2010 Debugger while executing an ASP.Net page with partial postbacks?

When working on an ASP.Net page that utilizes an UpdatePanel with validated controls for partial postbacks, an issue arises with the Visual Studio 2010 script debugger window. The debugger window starts displaying a continuous list of "Script Block" entries, which seem to be anonymous or auto-generated functions associated with the controls on the panel as it gets reloaded. It seems that the old script blocks from previous page updates are not properly disposed of, leading to a continuous growth in the list. This causes the page and debugger to slow down significantly, and even after closing IE, it takes a long time to delete the numerous blocks that have accumulated.

It is unclear if this issue stems from the way the page is functioning or if it is a problem with the debugger itself. After comparing the performance of the debugged and non-debugged pages, it seems to be the latter. However, it would be beneficial to understand what is causing this behavior and how to address it.

javascriptasp.netvisual-studio-2010debugginginternet-explorer

Answer №1

Here is the solution for disabling script debugging in VS 2010.

Option One

When debugging through VS2008/2010, script debugging is automatically enabled in IE8 and later versions. This might not be desirable for everyone, but there are ways to work around it.

The first option mentioned in the article explains how to enable Silverlight debugging and provides the path for both Projects and Websites on how to do it.

Enabling Silverlight debugging will turn off JS debugging as they cannot run simultaneously.

One downside is that Silverlight tools for VS need to be installed.

Option Two

Start the application without debugging (CTRL + F5) and then manually attach the debugger by clicking on Debug->Attach to Process.

For VS 2008 Users

For VS 2008, there are various alternatives such as editing registry keys, etc.

If you need help with VS 2008 regarding this issue, refer to this link.

Answer №2

When the Timer is placed inside the UpdatePanel, it will be re-instantiated upon the refresh of the UpdatePanel, allowing it to continue executing additional JavaScript code. To address this, it is recommended to move the Timer outside the UpdatePanel and connect it with Triggers.

The code below demonstrates how to create a Timer that updates a Panel by calling GetStatus from the code-behind.

<asp:Timer runat="server" ID="Timer1" Interval="5000" OnTick="GetStatus" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
    </Triggers>
    <ContentTemplate>
        <fieldset>
            <asp:Button ID="Button1" runat="server" Text="DoStuff"
                OnClick="Button1_Click" />
            <asp:Label ID="Label1" runat="server" Text="Blank"></asp:Label>
        </fieldset>
    </ContentTemplate>
</asp:UpdatePanel>


    protected void GetStatus(object sender, EventArgs e)
    {
        Label1.Text = "Stuff!!!";
    }

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