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    <p><code>IComparable</code> exposes <a href="http://msdn.microsoft.com/en-us/library/system.icomparable.compareto.aspx" rel="nofollow"><code>CompareTo</code></a>. <code>&lt;</code> and <code>&gt;</code> must be overloaded separately:</p> <pre><code>class Foo : IComparable&lt;Foo&gt; { private static readonly Foo Min = new Foo(Int32.MinValue); private readonly int value; public Foo(int value) { this.value = value; } public int CompareTo(Foo other) { return this.value.CompareTo((other ?? Min).value); } public static bool operator &lt;(Foo a, Foo b) { return (a ?? Min).CompareTo(b) &lt; 0; } public static bool operator &gt;(Foo a, Foo b) { return (a ?? Min).CompareTo(b) &gt; 0; } } </code></pre> <p>I <em>edited</em> the code so that it does not fail when comparing against <code>null</code>. To keep it brief I used a shortcut that works unless <code>value</code> is <code>Int32.MinValue</code> for a proper <code>Foo</code>. Strictly speaking you'd have to check for <code>null</code> explicitly to get <a href="http://msdn.microsoft.com/en-us/library/system.icomparable.compareto.aspx" rel="nofollow">the contract</a> right:</p> <blockquote> <p>By definition, any object compares greater than (or follows) null, and two null references compare equal to each other.</p> </blockquote> <p>Besides, implementing <code>IComparable&lt;T&gt;</code> means that <code>CompareTo(T value)</code> takes a parameter of <code>T</code>. Therefore <code>MyCalendar : IComparable&lt;MyCalender&gt;</code> should implement a method <code>CompareTo(MyCalendar other)</code> rather than <code>PersianDate</code> (or implement <code>IComparable&lt;PersianDate&gt;</code>).</p>
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    1. COthanks a lot, i use this code but when i use public Foo(int value) i get error" must be fully assigned before control is returned to the caller"
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    2. CODid you initialize all `readonly` fields? The `Foo` class I wrote in VS2012 compiles, since `value` is initialized.
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    3. COYes it is readnly. I use vs2012 RC. I have 3 Initializes instance of the MyCalender structure.
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