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copied!<p>You are using 4 different methods of comparison, result in different results:</p> <ul> <li>Operator <code>==</code> will by default do a check if the references are equal. In this case you have two instances, so they do have two different references. The behavior of <code>==</code> can overridden by any type (like <code>string</code> has its own method of comparison), but in case of the <code>StringBuilder</code> it is not.</li> <li>Method <code>StringBuilder.Equals(StringBuilder)</code> will compare with another StringBuilder and compares some inside values. These values are, in your case, the same. Strange thing is that <code>StringBuilder</code> does not override the method <code>StringBuilder.Equals(object)</code> to apply the same logic.</li> <li>Method <code>object.Equals(object, object)</code> will try to call the method <code>.Equals(object)</code> of one of the objects. In this case: <code>StringBuilder.Equals(object)</code> which, as I said, did not have the logic to compare the values. Resulting in just a compare of the references of both instances.</li> <li><code>Object.ReferenceEquals</code> will just compare the references.</li> </ul> <p>For more info, see:</p> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/f37cfeys.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/f37cfeys.aspx</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/w4hkze5k.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/w4hkze5k.aspx</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/system.object.referenceequals.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.object.referenceequals.aspx</a></li> </ul>

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