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POLabels removed from this.Controls keep reappearing
 

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    <p>I am a novice <code>C#</code> programmer, trying to create a simple <code>RSS/Atom</code> aggregator webpart for a <code>SharePoint</code> site (I can't use the ootb part as I don't have an Enterprise licence).</p> <p>I have 3 buttons: </p> <ol> <li>New Feed, which takes a <code>URI</code> from the user and attempts to construct a label displaying the feed and add it to <code>this.Controls;</code> </li> <li>Clear Feeds, which clears all the displayed feeds (removing them from <code>this.Controls</code>) </li> <li>Default Feeds, which takes an <code>ArrayList</code> of default <code>URIs</code> and converts them each into labels (also adding them to <code>this.Controls</code>).</li> </ol> <p>Clearing the feeds works fine, as does reverting to the defaults. However, after clearing all the feeds and trying to add a new feed, the defaults are added as well (and only one new feed can be added at a time, the new one overwriting the old). I suspect this is because I don't fully understand the add/remove controls function. Code follows below:</p> <pre><code> ArrayList viewedFeeds = new ArrayList(); ArrayList defaultFeeds = new ArrayList(); //Contains several default feeds, e.g. BBC news (http://feeds.bbci.co.uk/news/rss.xml) private void newFeed_Click(object sender, EventArgs e) { renderFeed(userText.Text); } private void clearFeeds_Click(object sender, EventArgs e) { clearAllFeeds(); } private void defaultFeeds_Click(object sender, EventArgs e) { clearAllFeeds(); initialiseFeedViewer(); } private void clearAllFeeds() { foreach (Label feed in viewedFeeds) { this.Controls.Remove(feed); } viewedFeeds.Clear(); } private void initialiseFeedViewer() { foreach (string uri in defaultFeeds) renderFeed(uri); } private void renderFeed(String uri) { try { Label feed = new Label(); // Create a Syndicated feed reader, parse the XML and add the relevant text to the label "feed" feed.BorderStyle = System.Web.UI.WebControls.BorderStyle.Double; viewedFeeds.Add(feed); this.Controls.Add(feed); } catch (Exception ex) { //Print an error message (e.g. If the URI does not link to a suitable feed } } </code></pre>
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