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    <p>From Reference to MSDN If the UpdateMode property is set to Conditional, the UpdatePanel control’s content is updated when one of the following is true:</p> <ol> <li>When the postback is caused by a trigger for that UpdatePanel<br> control.</li> <li>When you explicitly call the UpdatePanel control's Update method.</li> <li>When the UpdatePanel control is nested inside another UpdatePanel control and the parent panel is updated.</li> <li>When the ChildrenAsTriggers property is set to true and any child control of the UpdatePanel control causes a postback. Child controls of nested UpdatePanel controls do not cause an update to the outer UpdatePanel control unless they are explicitly defined as triggers for the parent panel.</li> </ol> <p>So Set ChildrenAsTigger to false set asynchrnous trigger for your first update panel like below.</p> <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" ChildrenAsTriggers="false" runat="server"&gt; &lt;ContentTemplate&gt; &lt;fieldset style="width:30%"&gt; &lt;legend&gt;Panel - 1 &lt;/legend&gt; &lt;asp:Label ID="label1" runat="server"&gt;&lt;/asp:Label&gt; &lt;asp:Button ID="b1" runat="server" OnClick="both" Text="Update Both Pannels" /&gt; &lt;asp:Button ID="b2" runat="server" OnClick="one" Text="Update Single Pannel" /&gt; &lt;/fieldset&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="b1" EventName="Click" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; &lt;asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional"&gt; &lt;ContentTemplate&gt; &lt;fieldset style="width:30%"&gt; &lt;legend&gt;Panel - 2 &lt;/legend&gt; &lt;asp:Label ID="label2" runat="server"&gt;&lt;/asp:Label&gt; &lt;/fieldset&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="b2" EventName="Click" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>After that on click of B1 BUTTON update the sceond update panel explicitly...like below</p> <pre><code>protected void both(object sender, EventArgs e) {     label1.Text = DateTime.Now.ToLongTimeString();     label2.Text = DateTime.Now.ToLongTimeString(); UpdatePanel2.Update(); } protected void one(object sender, EventArgs e) {     label1.Text = DateTime.Now.ToLongTimeString();     label2.Text = DateTime.Now.ToLongTimeString(); UpdatePanel2.Update(); } </code></pre>
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    1. POBoth Updatepanel's getting update, while only 1 have to work
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    1. USAmit Singh
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    1. COThanks again :) This doesn't loads the `Label1`. `Label2` works correctly if the `both` button called. What to do?
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    2. CO@Developer couldn't get u?
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    3. COIf I change `ChildrenAsTriggers="false", Label1` doesn't get affected in any case. It simply remains blank.?
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