Update panel AsyncPostBack not update pannel

Question

Hello, i'm create simple visual webpart, but update panel not update updatepanel1 if is using async callback. Response from button click:
http://pastebin.com/zWmPL4XB, if use PostBackTriger it work fine. ScriptManager.EnablePartialRendering="true"
<%@ Register Tagprefix="WebPartPages" Namespace="Microsoft.SharePoint.WebPartPages" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" %>
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="VisualWebPart1.ascx.cs" Inherits="VisualWebPartProject2.VisualWebPart1.VisualWebPart1" %>
<div>
<%--<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server"></asp:ScriptManagerProxy>--%>
<%--<asp:Timer ID="Timer1" runat="server" Interval="5000" OnTick="Timer1_Tick"></asp:Timer>--%>
<asp:label ID="Label2" runat="server" text="Label"></asp:label>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click"></asp:Button>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" >
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Button1" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:label ID="Label1" runat="server" text="Label"></asp:label>
</ContentTemplate>
</asp:UpdatePanel>
</div>

Answer 1

Hi,
According to your description, you want to use UpdatePanel control in SharePoint visual web part.
We can invoke click event on Button by jQuery, the code like this:
<script src="http://code.jquery.com/jquery-1.11.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#Button1").click(function () {
console.log('clicked');
$("#<%=Button1.ClientID %>").click();
</script>
Reference:
http://stackoverflow.com/questions/17473892/partial-render-ajax-c-asp-net-visual-web-part
We can also use SharePoint JavaScript Object Model instead of UpdatePanel, more information is here:
http://social.msdn.microsoft.com/Forums/office/en-US/691affb9-eb6d-4777-b7fe-7d17bf1d98a5/updating-contents-in-a-custom-webpart-in-a-discussion-board-topic-page?forum=sharepointdevelopment
Best Regards
Dennis Guo
TechNet Community Support