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copied!<p><strong>Edit2:</strong> </p> <p>Referring <a href="https://gist.github.com/973510" rel="nofollow">https://gist.github.com/973510</a>, its clear from the returned json, that if a particular facebook message doesnt have any likes, then the returned json doesnt contain a property called <code>likes</code>. Hence <code>likes</code> property of <code>sdata object</code> is null. Thats just how the server returns the data. </p> <p>There are two ways you can deal with this. Either do a manual check whether <code>likes</code> is null. Or initialize the likes property in the sdata constructor. And initialize the likesdata list in the likesdatacollection constructor. </p> <p>Code:</p> <pre><code>public class sdata { // other properties public likedatacollection likes { get; set; } public sdata() { likes = new likedatacollection(); } } public class likedatacollection { public List<likesdata> data { get; set; } public likedatacollection() { data = new List<likesdata>(); } } </code></pre> <p>This way, even if fb doesnt return any likes, the constructors will initialize the properties, so they will not be null. You can then check whether <code>likes.data.Count > 0</code>. If yes, then fb returned likes, else fb didnt return likes.</p> <p><strong>Edit1:</strong></p> <p>From the OP's comment, its clear that the json is properly formed. Meaning, the json is as retrieved from some server api. Therefore it is the <code>sdata</code> class that is the culprit. Please look at <a href="https://gist.github.com/973457" rel="nofollow">this gist</a> for the full solution. </p> <p>The short version. For the simplest case, your c# classes need to follow the exact same structure as your json. As per the json, <code>data</code> has a property called <code>likes</code>. the <code>likes</code> object has a property called <code>data</code> which is an array of objects with properties id and name. </p> <p>So your c# class <code>sdata</code> should have a property called <code>likes</code> of type <code>likesdatacollection</code>. This class should have a property <code>data</code> of type <code>List<likesdata></code>... </p> <p>Off topic, people generally seem to prefer Json.Net ... so you may want to use that. The reason I use it is because I need it to work in a .Net 2.0 code base ... </p>

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