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    <p>From .NET 3.5 you can do this below. It will throw an exception if it's not a valid feed.</p> <pre><code>using System.Diagnostics; using System.ServiceModel.Syndication; using System.Xml; public bool TryParseFeed(string url) { try { SyndicationFeed feed = SyndicationFeed.Load(XmlReader.Create(url)); foreach (SyndicationItem item in feed.Items) { Debug.Print(item.Title.Text); } return true; } catch (Exception) { return false; } } </code></pre> <p>Or you can try parsing the document by your own:</p> <pre><code>string xml = "&lt;?xml version=\"1.0\" encoding=\"utf-8\" ?&gt;\n&lt;event&gt;This is a Test&lt;/event&gt;"; XmlDocument xmlDoc = new XmlDocument(); xmlDoc.LoadXml(xml); </code></pre> <p>Then try checking the root element. It should be the feed element and have "<a href="http://www.w3.org/2005/Atom" rel="nofollow noreferrer">http://www.w3.org/2005/Atom</a>" namespace:</p> <pre><code>&lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule" xmlns:re="http://purl.org/atompub/rank/1.0"&gt; </code></pre> <p>References: <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.syndication.syndicationfeed.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/system.servicemodel.syndication.syndicationfeed.aspx</a> <a href="http://dotnet.dzone.com/articles/systemservicemodelsyndication" rel="nofollow noreferrer">http://dotnet.dzone.com/articles/systemservicemodelsyndication</a></p>
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    1. POCheck if a URL is a valid Feed
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    1. USAkira Yamamoto
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    1. COSince my project in a web application, So I can't trust the header. Someone may give an invalid feed, but valid XML and valid root element, Then my app hang... :(
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      1. USMahdi Ghiasi
    2. COThanks for the update. But a question: `System.ServiceModel.Syndication` supports what feed formats?
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      1. USMahdi Ghiasi
    3. CO<feed> in Atom 1.0 and <rss> in RSS 2.0. http://msdn.microsoft.com/en-us/library/system.servicemodel.syndication.syndicationfeed.aspx
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      1. USAkira Yamamoto
 

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