> For the complete documentation index, see [llms.txt](https://docs.workflowgen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.workflowgen.com/vs-web-forms/ajax-mode.md).

# AJAX Mode

## Custom ASPX forms in AJAX mode

If you're developing a custom ASPX form in AJAX mode, do the following:

1. In the `<form runat="server">` element, add a `ScriptManager` at the beginning of the form and wrap all the form content in the `contenttemplate` of an `UpdatePanel`.<br>

   📌 **Example**

   ```html
   <form id="form1" name="form1" runat="server">
       <asp:scriptmanager id="ScriptManager1" runat="server"></asp:scriptmanager>
       <asp:updatepanel id="UpdatePanel1" runat="server">
           <contenttemplate>
               ... form content ...
           </contenttemplate>
       </asp:updatepanel>
   </form>
   ```
2. Since standard `FileUpload` controls are not supported inside the `UpdatePanel`, use the custom `WorkflowFileUpload` user control for your attachment needs.<br>
3. Add the following line in the page constructor to prevent an issue that can occur when updating a row in a GridView:

   ```
    this.UseClientSideOptimization = false;
   ```

   You will see no difference at runtime, since all this does is prevent a postback when clicking the **Update** button and the validation fails. The `UpdatePanel` already prevents postback.<br>
4. Register the postback triggers either in the **Page\_Load** event or directly in the **ASPX** page for each of your ASP.NET controls that perform a `postback` or `submit to WorkflowGen`.

   To do this in the **Page\_Load** event:

   ```
    ScriptManager.GetCurrent(this).RegisterPostBackControl(MyControlID);      
   ```

   \
   To do this in the **ASPX** page:

   1. Add a `<Triggers>` element to the `UpdatePanel`.
   2. Add a `<asp:PostBackTrigger ControlID="MyControlID" />` element for each of the controls that requires a postback trigger.


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