How will you specify what version of the framework your application is targeting?

Answer:

In Asp.Net 4.0 a new element "targetFramework" of compilation tag (in Web.config file) lets you specify the framework version in the web.config file as

<?xml version="1.0"?>

<configuration>

<system.web>

<compilation targetFramework="4.0" />

</system.web>

</configuration>

It only lets you target the .NET Framework 4.0 and later versions.