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POcan not access control inside asp.net updatepanel
 

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  1. POcan not access control inside asp.net updatepanel
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    <p>I use this official sample from Microsoft:</p> <p>When I try to access the MyLabel from codebehind in the click event the MyLabel is NULL.</p> <p>Why this?</p> <pre><code>&lt;asp:ScriptManager ID="PageScriptManager" runat="server" /&gt; &lt;asp:Button ID="MyButton" Text="Click Me" runat="server" onClick="MyButton_Clicked" /&gt; &lt;asp:UpdatePanel ID="MyUpdatePanel" runat="server"&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="MyButton" EventName="Click" /&gt; &lt;/Triggers&gt; &lt;ContentTemplate&gt; &lt;asp:Label ID="MyLabel" Text="OldText" runat="server" /&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; private void MyButton_Clicked(object sender, EventArgs e) { MyLabel.Text = "NewText!"; } </code></pre> <p><strong>UPDATE</strong> This code does not work Why? The MyLabel is always NULL on server side ??</p> <pre><code>&lt;%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %&gt; &lt;asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"&gt; &lt;/asp:Content&gt; &lt;asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"&gt; &lt;asp:ScriptManager runat="server" ID="xx"&gt; &lt;/asp:ScriptManager&gt; &lt;asp:ImageButton OnClick="OnClickRefreshButton" ID="RefreshImageButton" runat="server" Width="100px" /&gt; &lt;asp:UpdatePanel ID="MyUpdatePanel" runat="server"&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="RefreshImageButton" EventName="Click" /&gt; &lt;/Triggers&gt; &lt;asp:ContentTemplate&gt; &lt;asp:Label ID="MyLabel" Text="OldText" runat="server" /&gt; &lt;/asp:ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; &lt;/asp:Content&gt; protected void OnClickRefreshButton(Object sender, ImageClickEventArgs e) { MyLabel.Text = "NewText!"; } </code></pre>
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    1. COHi there, try to put the button and the label "inside" the update panel.
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      1. USTheNewOne
    2. COThe button is already in the updatepanel. When I put the button there then I get this exception: A control with ID 'RefreshImageButton' could not be found for the trigger in UpdatePanel 'MyUpdatePanel'. Description
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    3. COtry to take this `<asp:Button ID="MyButton" Text="Click Me" runat="server" onClick="MyButton_Clicked" />` and put it under the label inside `<ItemTemplate>` and then close it `</ItemTemplate>` - so it should be <asp:Label ID="MyLabel" Text="OldText" runat="server" /> and then the itemtemplate then the button.
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