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copied!<p>It appears from <a href="http://msdn.microsoft.com/en-us/magazine/cc163317.aspx" rel="nofollow">this MSDN article</a> that this is due to security concerns.</p> <blockquote> <p>I have often heard the concern that extension methods can be used to hijack or subvert the intended behavior of existing methods. Visual Basic addresses this by ensuring that, wherever possible, an instance method is preferable over an extension method.</p> <p>The language allows extension methods to be used to create overloads for existing instance methods with different signatures. This allows extension methods to be used to create overloads, while preventing the existing instance method from being overridden. If an extension method exists with the same signature as an instance method, the shadowing rules that are built into the compiler will prefer the instance method, therefore eliminating the possibility of an extension method overriding existing base class instance functionality</p> </blockquote> <p>This is VB focused (and instance focused), but still, the general idea is there. Basically, the extension method takes the lowest precedence so that methods cannot be hijacked, and since the class already has a method signature for what you are trying to do, that takes precedence and throws the standard extension method error (when trying to call from an instance object). You can never have two methods with the same signature, and that is what you are asking to be attempted here essentially...and allowing it would be a security concern as explained above already. </p> <p>Then, add the confusion that will be created by this, and it is just a bad idea to allow it.</p>

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