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PORefreshing a Repeater control in an UpdatePanel with ASP.NET
 

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    <p>I'm trying to code a page where you can post a comment without reloading the whole page. The comments are displayed using a Repeater control. The template looks like this:</p> <pre><code> &lt;asp:UpdatePanel runat="server" ID="commentsUpdatePanel" UpdateMode="Conditional"&gt; &lt;ContentTemplate&gt; &lt;!-- Comments block --&gt; &lt;div class="wrapper bloc content"&gt; &lt;h3&gt;&lt;img src="img/comments.png" alt="Comments" /&gt;&amp;nbsp;Comments&lt;/h3&gt; &lt;p&gt;&lt;asp:Label ID="viewImageNoComments" runat="server" /&gt;&lt;/p&gt; &lt;asp:Repeater ID="viewImageCommentsRepeater" runat="server"&gt; &lt;HeaderTemplate&gt; &lt;div class="float_box marge wrapper comments"&gt; &lt;/HeaderTemplate&gt; &lt;ItemTemplate&gt; &lt;div class="grid_25"&gt; &lt;span class="user"&gt;&lt;%#Eval("username")%&gt;&lt;/span&gt;&lt;br /&gt; &lt;span style="font-size:x-small; color:#666"&gt;&lt;%#Eval("datetime") %&gt;&lt;/span&gt; &lt;/div&gt; &lt;div class="grid_75"&gt; &lt;p align="justify"&gt;&lt;%#Eval("com_text") %&gt;&lt;/p&gt; &lt;/div&gt; &lt;/ItemTemplate&gt; &lt;FooterTemplate&gt; &lt;/div&gt; &lt;/FooterTemplate&gt; &lt;/asp:Repeater&gt; &lt;/div&gt; &lt;!-- Post comment block --&gt; &lt;div class="wrapper bloc content"&gt; &lt;h3&gt;&lt;a id="post_comment" name="post_comment"&gt;&lt;img src="img/comment_edit.png" alt="Comments" /&gt;&lt;/a&gt;&amp;nbsp;Post a comment&lt;/h3&gt; &lt;p class="description"&gt;Please be polite.&lt;/p&gt; &lt;p&gt; &lt;asp:Label ID="postCommentFeedback" runat="server" /&gt; &lt;/p&gt; &lt;table border="0"&gt; &lt;tr&gt; &lt;td valign="top"&gt; &lt;asp:TextBox id="postCommentContent" runat="server" TextMode="MultiLine" MaxLength="600" Columns="50" Rows="15" Width="400px" /&gt; &lt;/td&gt; &lt;td valign="top"&gt; &lt;span style="font-size:x-small"&gt;BBCode is enabled. Usage :&lt;br /&gt; &lt;b&gt;bold&lt;/b&gt; : [b]bold[/b]&lt;br /&gt; &lt;i&gt;italic&lt;/i&gt; : [i]italic[/i]&lt;br /&gt; &lt;span class="style1"&gt;underline&lt;/span&gt; : [u]underline[/u]&lt;br /&gt; Link : [url=http://...]Link name[/url]&lt;br /&gt; Quote : [quote=username]blah blah blah[/quote]&lt;/span&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="2"&gt; &lt;asp:Button ID="postCommentButton" runat="server" Text="Submit" onclick="postCommentButton_Click" /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/div&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; </code></pre> <p>The postCommentButton_Click() function works just fine - clicking "Submit" will make the post. However, I need to completely reload the page in order to see new comments - the post the user just made will not show until then. I Databind the Repeater in Page_Load() after a (!isPostBack) check.</p> <p>The postCommentButton_Click() function looks like this:</p> <pre><code>protected void postCommentButton_Click(object sender, EventArgs e) { // We check if user is authenticated if (User.Identity.IsAuthenticated) { // Attempt to run query if (Wb.Posts.DoPost(postCommentContent.Text, Request.QueryString["imageid"].ToString(), User.Identity.Name, Request.UserHostAddress)) { postCommentFeedback.Text = "Your post was sucessful."; postCommentContent.Text = ""; } else { postCommentFeedback.Text = "There was a problem with your post.&lt;br /&gt;"; } } // CAPTCHA handling if user is not authenticated else { // CAPTCHA } } </code></pre> <p>In my case, we do see postCommentFeedback.Text refreshed, but, again, not the content of the repeater which should have one more post.</p> <p>What is it I'm missing?</p>
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    1. COI'm pretty sure that it's because the DataSource of my Repeater is a MySqlDataReader, and I don't update it after the user made his post. It's not updated because I do the databind only if(!IsPostBack)... What would be the correct way of doing this then? I should DataBind on each Page_Load(), yet I need to DataBind after a comment has been posted.
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