How To Switch a Website from 2.0 to 4.0 in IIS 6.0

Open IIS Manager , Expand Local computer , click on websites in left pane , the list of websites will be displayed in the right pane , Right Click on the website  for  which  you  want to change  the version , go to Properties , click ASP.NET tab , and  in the  ASP.NET  version you can change the version from 2.0 to 4.0 and vice-versa , select the required version and click OK .

You will be prompted with a message , that the change of  Frame version requires a restart of W3SVC  service . Click Yes .

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