http://msmvps.com/blogs/senthil/archive/2009/07/08/overload-resolution-and-null.aspxMy colleague Soundar discovered this rather interesting behavior. 1: class Test 2: { 3: public static void Main() 4: { 5: Test test = null ; 6: 7: Console.WriteLine(&quot; {0} &quot;, test); 8: Console.WriteLine(&quot; {0} &quot;, null ); 9: } 10: } IfenCommunityServer 2008.5 SP2 (Build: 40407.4157)http://msmvps.com/blogs/senthil/archive/2009/07/08/overload-resolution-and-null.aspx#1716598Wed, 19 Aug 2009 08:59:03 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1716598Thathi Reddy<p>Pretty interesting :)</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=1716598" width="1" height="1">http://msmvps.com/blogs/senthil/archive/2009/07/08/overload-resolution-and-null.aspx#1714983Wed, 12 Aug 2009 01:24:44 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1714983aryang<p>This is really very interesting!</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=1714983" width="1" height="1">http://msmvps.com/blogs/senthil/archive/2009/07/08/overload-resolution-and-null.aspx#1714982Wed, 12 Aug 2009 01:23:52 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1714982aryang<p>Thanks，and that&#39;s really Interesting!</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=1714982" width="1" height="1">http://msmvps.com/blogs/senthil/archive/2009/07/08/overload-resolution-and-null.aspx#1698750Wed, 08 Jul 2009 15:03:24 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1698750Gerald Naveen<p>Wonderful analysis!</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=1698750" width="1" height="1">