Linq not working after .Net 2.0 to 3.5

[chemaster]

I started developing an application several weeks ago and decided today that I may want to use LINQ. So I changed my project from .NET Framework 2.0 to 3.5 and restarted the program.

However, I can not get the most basic LINQ statement to work. I thought it was my code until I started a blank .NET 3.5 project and inserted the basic code (below) which worked without issue. So I then started another .NET 2.0 project and inserted the code (which I knew wouldn't work) and the errors are the same as the project that I converted. So next I converted this new .NET 2.0 to 3.5 and the code still doesn't work. So migrating from 2.0 to 3.5 isn't working for LINQ.

My question is: If one changes from a .NET 2.0 to a .NET 3.5 how do they get LINQ to work properly?

Thanks in advace for your suggestions.

        ' Data source.
        Dim numbers() As Integer = {0, 1, 2, 3, 4, 5, 6}

        ' Query creation.
        Dim evensQuery = From num In numbers
                         Where num Mod 2 = 0
                         Select num

        ' Query execution.
        For Each number In evensQuery
            Console.Write(number & " ")
            ListBox1.Items.Add(number)
        Next