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    <p>I think there's two consents here you don't understand (or I simply don't understand your question).</p> <p><code>this[..]</code> properties are index-properties. They are used like array-expressions. For instance, you could imagine creating your own "array" like this:</p> <pre><code>public class MyArray { string[] _storrage = new string[100]; public string this[int index] { get { return _storrage[index]; } set { _storrage[index] = value; } } } </code></pre> <p>You can create index-properties with multiple arguments as well, and they can be overloaded. For instance, some lists allows you to access items either by name (<code>this[string name]</code>) and index (<code>this[int index]</code>). In all actuality it's just syntactic sugar so you don't have to write methods like <code>getItem(int index)</code> as you do in java.</p> <p>The other consept that it seems you're not understanding (though not apparent from your question) is lambda-methods. In your code:</p> <pre><code>(item) =&gt; item.GetSelectLink(item.Id) </code></pre> <p>is a lambda-method. For instance if the method <code>Colum</code> on your <code>grid</code>-object has the following signature:</p> <pre><code>public void Column&lt;T&gt;(string name, Func&lt;T, string&gt;) </code></pre> <p>the expression <code>(item) =&gt; item.GetSelectLink(item.Id)</code> would evaluate to a method that takes a <code>T</code> and returns a string. An alternative way to create the same functionality is to do this:</p> <pre><code>// in class public string GetIdField(YourClassType item) { return item.GetSelectLink(item.Id); } // in Column-call grid.Column("Id", format: GetIdField); </code></pre> <p>You can read more about lambdas here: <a href="http://msdn.microsoft.com/en-us/library/vstudio/bb397687.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/vstudio/bb397687.aspx</a></p> <p><strong>[Edit]</strong><br> To show a quick example of a lambda that might shred some light on this:</p> <pre><code>var list = new List&lt;string&gt;() { "a", "b", "c" }; list.ForEach((item) =&gt; Console.WriteLine(item)); </code></pre> <p>this will output "a", "b" and "c" (see it run at <a href="http://ideone.com/MGZxfr" rel="nofollow">http://ideone.com/MGZxfr</a>). The equivalent (without using a lambda) would be something like this:</p> <pre><code>void Main() { var list = new List&lt;string&gt;() { "a", "b", "c" }; foreach(var item in list) Print(item); } void Print(string item) { Console.WriteLine(item); } </code></pre>
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    1. CO@Thanks Alxander. Yeah, I meant, i wasn't sure what the concrete type of "item" was, such I dug into the source code and found out it was "WebGridRow" class. Also thanks for pointing out it's an "indexer". Though, the source code of Webgrid used it in a completely different way (to get a property out of an object)
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    2. CO@Liming `item` isn't an indexer. That's why I said I think you're confusing two consepts. `item` is a method-parameter to the lambda.
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    3. CO@Liming see my new sample.
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