ASP.NET - FileUpload with PostBack Trigger?

I don't know why this is happening. However you could attempt to add the event yourself by override the OnInit page cycle event in the aspx. Cs file.

Remember to remove the Click event from your HTML page protected override void OnInit(EventArgs e) { btnUpload. Click+= new EventHandler(btnUpload_Click); base. OnInit(e); } Alternatively the Trigger might also need to be positioned directly below the UpdatePanel Tag asp:UpdatePanel ID="updPages" runat="server" UpdateMode="Conditional".

I don't know why this is happening. However you could attempt to add the event yourself by override the OnInit page cycle event in the aspx. Cs file.

Remember to remove the Click event from your HTML page. Protected override void OnInit(EventArgs e) { btnUpload. Click+= new EventHandler(btnUpload_Click); base.

OnInit(e); } Alternatively the Trigger might also need to be positioned directly below the UpdatePanel Tag.

Thanks, but this didn't work.. – Echilon May 7 '10 at 15:09.

On your UpdatePanel, try adding the attribute ChildrenAsTriggers="false". This will stop any controls in the UpdatePanel causing asynchronous postbacks, so for every control that you want to cause a postback, you'll have to add an AsyncPostBackTrigger in the UpdatePanel's Triggers section.

Not something I'd thought of but it had no effect. – Echilon May 7 '10 at 15:09.

The button is set as a trigger, but the event handler for the button fails to execute on the first PostBack. The button works without fail on the second and subsequent times, just not the first. Is there any reason for this?

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