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update panel - dropdown selected index change event not triggering

I have one dropdownlist on my page (.aspx) and based on change of selected value i need to bind the data to checkboxlist control which is on the same page. To avoid entire page to be refreshed, i have put the controls in the update panel.
But when i am changes the selection from the dropdown,, it is getting back to the first value itself and the selected index changed even is not getting triggered.
here is how I have put my controls in the update panel.
<asp:Content ID="Main" ContentPlaceHolderID="PlaceHolderMain" runat="server">
<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server"></asp:ScriptManagerProxy>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<fieldset>
<div id="attachmentdiv">
<asp:DropDownList ID="ddlimportfiles" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlimportfiles_onselectedindexChange"></asp:DropDownList>
</div>
<div id="voltagediv">
<asp:CheckBoxList ID="chkBoxLstVoltage" runat="server"></asp:CheckBoxList>
</div>
<asp:Button ID="btnGenerateZBF" runat="server" Text="Generate ZBF" OnClick="GenerateZBF_Click" />
</fieldset>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlimportfiles" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
</asp:Content>
kindly suggest what I am doing wrong here.

button click event on update panel not firing in multiple user control

I am having an update panel which user control in it
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<uc1:SelectionAjax ID="SelectionAjax1" runat="server" />
<ppmp:PinPadModal ID="ppmodal" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
and inside this user control I am calling another two user controls each user control which has its own update panel
// First User Control
<asp:UpdatePanel ID="UpP1" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnFinalConfirmation" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Button ID="btnFinalConfirmation" runat="server" Text="Confirm" OnClick="btnFinalConfirmation_Click1" />
</ContentTemplate>
</asp:UpdatePanel>
//Second User Control
<asp:UpdatePanel ID="UpPanel1" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="btnConfirmation" runat="server" Text="Confirm" OnClick="btnConfirmation_Click1" />
</ContentTemplate>
</asp:UpdatePanel>
The issue is that button click event is only being fired on the second user control not the first one how should I solve this

Include ScriptManager in your Aspx Page.This ScriptManager control provides support for client-side AJAX features in an AJAX enabled web pages.
<asp:ScriptManager ID="ScriptManager1" runat="server"/>

Update panel not working in two asp panel

In my ascx page I have two panel,I trying to change these panels inside an update panel.but the page load is going on each click on radio button.here is my code
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Panel ID="Panel2" runat="server" >
<asp:RadioButtonList runat="server" ID="radioListAnswers" RepeatDirection="Horizontal" AutoPostBack="true" ClientIDMode="Static" onselectedindexchanged="radioListAnswers_SelectedIndexChanged">
</asp:RadioButtonList>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="radioListAnswers" EventName="SelectedIndexChanged"/>
</Triggers>
<ContentTemplate>
<asp:Panel ID="Panel1" runat="server" Visible="false">
<div> Thanks</div>
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
here is my code behind
void radioListAnswers_SelectedIndexChanged(object sender, EventArgs e)
{
panel2.Visible=false;
panel1.Visible=true;
}
on click on each radio button the page is reloading.How can we over come this.
Thanks in advance for help.

i hope this will help. Pls check this link
https://msdn.microsoft.com/en-us/library/bb398867(v=vs.140).aspx

Update Panel and Timer Not working in list View

Hi I have a list view and I am trying to refresh it using an update panel and a timer for trigger. I have tried everything I know but I can get it to update the Listview, but I used a label to test with Time Now which works. So the update panel and trigger are working, but the listview is not refreshing.
<asp:Timer ID="Timer1" runat="server" Interval="100" OnTick="Timer1_Tick"></asp:Timer>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:ListView ID="ListView2" runat="server" DataSourceID="displayFollowers" DataKeyNames="ProfileId"></asp:ListView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="DataBinding" />
</Triggers>
</asp:UpdatePanel>

You should be calling ListView2.DataBind() in the Timer_Tick event for that to work. It does not automatically refresh once initially bound.

ASP.NET Update Panel within ListView Control not updating

Basically I have this situation
Page >
Update Panel >
User Control >
List View >
User Control (Within item template) >
Update Panel
When I click on a button within the inner most update panel, I want the content of the update panel to update. This isn't happening. However, the click handler is being hit fine asynchronously. The update panel just doesn't want to update.
Code - I've created a simple test web app that replicates the problem, and shared it on my google drive: UpdatePanelInListViewTest.zip, but here's the markup:
Page:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="ajaxParent" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<uc1:ListUserControl ID="ListUserControl1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
List User Control:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="ListUserControl.ascx.cs" Inherits="UpdatePanelInListViewTest.ListUserControl" %>
<%# Register src="MiniWidget.ascx" tagname="MiniWidget" tagprefix="uc1" %>
<asp:ListView ID="lstTest" runat="server">
<ItemTemplate>
Item
<uc1:MiniWidget ID="MiniWidget1" runat="server" />
</ItemTemplate>
</asp:ListView>
Mini Widget User Control
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="MiniWidget.ascx.cs" Inherits="UpdatePanelInListViewTest.MiniWidget" %>
<asp:UpdatePanel ID="ajaxWidget" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:LinkButton ID="lnkTest" runat="server" onclick="lnkTest_Click">Test</asp:LinkButton>
<asp:Label ID="lblTest" runat="server" Text=""></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
I've tried different permutations of this; i.e. having the button outside the panel and adding a trigger etc but I just cannot get it to update.
It appears that because the user control is within an item template of the parent list view it causes the update panel to not update for some reason...

The problem is to do with when you call the databind method within ListUserControl.
Moving lstTest.DataBind(); so that it executes within the Page_Load rather than the Page_PreRender fixes the issue for your simple test web app.

have u tried:
<asp:UpdatePanel ID="ajaxPanel" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnTest" />
</Triggers>
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:Button ID="btnTest" runat="server" Text="Test" onclick="btnTest_Click" />
</ContentTemplate>
</asp:UpdatePanel>