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Upgrading .NET code from previous versions to .NET 4.5x

LGroup1
LGroup1 asked
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Last Modified: 2015-03-02
Sorry as I do not have a .NET background. What does it take to update version 2.x and 3.x .NET code to .NET 4.5x code ?  For example, if a site or client has dozens or hundreds of WWW sites and pages that are or were written in .NET 2.x and 3.x what would it take for those sites to upgrade or update those sites to the most recent version of .NET 4.5x ?   Would it be as simple as installing the .NET 4.5x framework on the Windows Server 2012 / IIS 8.x servers and then migrating and  running the old sites on them ?  Or does one have to recompile all of the older .NET  2.x and 3.x code - fixing and updating errors along the way - to get the code up to .NET 4.5x ?  TIA ...
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