Updating Label inside UpdatePanel - asp.net

Question

i have a label and button inside update panel, when i try to get the value from the label on the button click, i get the value from label, but when i try to set the value to the label, it does not happens, i checked for JavaScript error, but there wasn't any, does anyone have any guess what could be the reason. i am using dotnetnuke and here is my code
<asp:UpdatePanel ID="updSection6" runat="server"><ContentTemplate>
<asp:Label ID="lbl" runat="server" />
<asp:ImageButton ImageUrl="/images/edit.gif" ID="btnEditSectionStory6" runat="server" OnClick="Clicked" />
</ContentTemplate></asp:UpdatePanel>
and here's the code
protected void Clicked(object sender, EventArgs e)
{
lbl.Text="Welcome";
}

Answer 1

You need to add the following code
<Triggers>
<asp:PostBackTrigger ControlID="btnEditSectionStory6" />
</Triggers>
Just before your closing </asp:UpdatePanel>
So your code should look like:
<asp:UpdatePanel ID="updSection6" runat="server">
<ContentTemplate>
<asp:Label ID="lbl" runat="server" />
<asp:ImageButton ImageUrl="/images/edit.gif" ID="btnEditSectionStory6" runat="server" OnClick="Clicked" />
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnEditSectionStory6" />
</Triggers>
</asp:UpdatePanel>
ASP PostBackTrigger
Specifies a control and event that will cause a full page update (a
full page refresh). This tag can be used to force a full refresh when
a control would otherwise trigger partial rendering.
You can read more about UpdatePanel's and Triggers here.
C# (using the ImageClickEventArgs)
protected void Clicked(object sender, ImageClickEventArgs e)
{
lbl.Text = "Welcome";
}