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why .net2.0 project or .net3.5 project can not reference .net4.0 assembly

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :WPF
 

if the machine support .net3.5, .net2.0 project can reference .net3.5 aseembly and can load and call the functions. 

But why .net2.0 project or .net3.5 project can not reference .net4.0 assembly even the machine support .net4.0




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