C# Windows Phone Mango - Invalid cross-thread access? parsing XML

[hexspesee]

I have the following code which seems to throw a "Invalid cross-thread access." and I can't seem to figure out why. I'm loading a remote xml file from a URL, however, when parsing that XML I always receive this error. Any suggestions?\[code\]using (StreamReader streamReader = new StreamReader(response.GetResponseStream())) { string xml = streamReader.ReadToEnd(); using (XmlReader reader = XmlReader.Create(new StringReader(xml))) { reader.ReadToFollowing("channel"); reader.MoveToFirstAttribute(); reader.ReadToFollowing("title"); output.AppendLine("Title: " + reader.ReadElementContentAsString()); reader.ReadToFollowing("description"); output.AppendLine("Desc: " + reader.ReadElementContentAsString()); textBox1.Text = output.ToString(); //Invalid cross-thread access. } }\[/code\]The XML I'm trying to parse looks like the following, I'm just trying to parse bits and pieces as I continue to learn how to use c# to parse different types of XML:\[code\]<?xml version="1.0" encoding="utf-8"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"xmlns:dc="http://purl.org /dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0 /modules/slash/"> <channel><title>Server & Site News</title><description>A place for the Admin and Moderators to post the latest news on both the server and site.</description><pubDate>Fri, 18 May 2012 22:45:08 +0000</pubDate><lastBuildDate>Fri, 18 May 2012 22:45:08 +0000</lastBuildDate><generator>Forums</generator><link>http://removedurl.com/forums/server-site-news.23/</link><atom:link rel="self" type="application/rss+xml" href="http://removedurl.com/forums/server-site-news.23/index.rss"/><item> <title>Example Title</title> <pubDate>Mon, 14 May 2012 17:39:45 +0000</pubDate> <link>http://removedurl.com/threads/back-fully-working.11013/</link> <guid>http://removedurl.com/threadsback-fully-working.11013/</guid> <author>Admin</author> <dc:creator>Admin</dc:creator> <slash:comments>14</slash:comments></item></channel>\[/code\]