---
title: "Ajax UpdatePanel not firing?"  
description: "Ajax UpdatePanel not firing?"  
author: "Anonymous User"  
published: 2014-08-21  
updated: 2014-08-21  
canonical: https://www.mindstick.com/forum/2073/ajax-updatepanel-not-firing  
category: "asp.net"  
tags: ["asp.net"]  
reading_time: 1 minute  

---

# Ajax UpdatePanel not firing?

I am not [understanding](https://www.mindstick.com/articles/12918/cat-5e-vs-cat-6a-understanding-the-major-differences) why this doesn't fire. It will not even call the event. Any thoughts? Really what I want to do, is prevent a [full](https://www.mindstick.com/articles/12893/experience-the-full-power-of-suitecrm) [post](https://www.mindstick.com/articles/12829/aspects-that-make-australia-post-shipping-extension-a-useful-tool)-back. The [page](https://www.mindstick.com/articles/13031/why-to-make-a-wikipedia-page) is [large](https://www.mindstick.com/interview/34471/what-is-a-large-language-model-llm) and each time it does a post back it jumps to the top.

```
<asp:UpdatePanel runat="server" id="UpdatePanel" updatemode="Conditional">    <ContentTemplate>    <p>        <asp:Label runat="server" ID="lblSnippet" AssociatedControlID="cmbSnippet">            From snippet:        </asp:Label>        <asp:DropDownList runat="server" ID="cmbSnippet" CssClass="dropdown" AutoPostBack="true">            <asp:ListItem>                None            </asp:ListItem>            <asp:ListItem>                Read Part            </asp:ListItem>            <asp:ListItem>                Read Feed            </asp:ListItem>        </asp:DropDownList>    </p>    <!--Code-->    <p>           <asp:Label runat="server" ID="lblCode" AssociatedControlID="txtCode">            From code:        </asp:Label>        <asp:TextBox runat="server" ID="txtCode" TextMode="MultiLine" CssClass="editor" MaxLength="100" Height="200" Wrap="false" />    </p>     </ContentTemplate>    <Triggers>         <asp:Asyncpostbacktrigger controlid="cmbSnippet" eventname="SelectedIndexChanged" />    </Triggers></asp:UpdatePanel>
```

## Replies

### Reply by Sumit Kesarwani

Hi Ankita,

<asp:DropDownList runat="server" ID="cmbSnippet" CssClass="dropdown" AutoPostBack="true" OnSelectedIndexChanged="cmbSnippet_SelectedIndexChanged">


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Original Source: https://www.mindstick.com/forum/2073/ajax-updatepanel-not-firing

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