Help with UpdatePanel ASPX

[Xcelled194]

Hi all,

I'm designing a web page in ASPX. I have a few textboxes where the user enters the number of items, and a label that shows what they would currently pay if they checked out at that moment. I need help using a UpdatePanel to refresh the label when they make a change. I have a custom function called Calc() that calulates and returns the amount they owe.. So, for example, when the user changes the text in textbox8, I want the label to be updated with the new value of calc(). Heres my code for the updatepanel/label:

<asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
          <asp:UpdatePanel ID="UpdatePanel1" runat="server">
              <ContentTemplate>
                  <asp:Label ID="Label1" runat="server" Font-Bold="True" Font-Size="20pt" 
              style="text-align: center" Text="You owe: $0.00"></asp:Label>
              </ContentTemplate>
          </asp:UpdatePanel>

Then, in my Textbox8.TextChanged method:

Private Sub TextBox8_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox8.TextChanged
        Me.Label1.Text = "You owe: " & Calc()
        Me.UpdatePanel1.Update()
    End Sub

But that doesnt refresh the label. What am I doing wrong?

[kvprajapati]

Set AutoPostBack=True of Textbox8 control.

[Xcelled194]

Set AutoPostBack=True of Textbox8 control.

I did, but now it reloads the entire page, not just the UpdatePanel

[vuyiswamb]

What you need to do is to add triggers in your update panel and select the textbox and select the correct event.