VB.net Issue trying to unzip folder

I am trying to unzip a folder using the code example below
I am pretty sure that I have .NET 4.5 installed on my machine
but it still doesn't recognize ZipFile
 I tried to add a reference to Imports System.IO.Compression
but can't find it.
I can see it in the bottom box in the attached image
Not sure what to do

Imports System.IO
Imports System.IO.Compression

Module Module1

    Sub Main()
        Dim startPath As String = "c:\example\start"
        Dim zipPath As String = "c:\example\result.zip"
        Dim extractPath As String = "c:\example\extract"

        ZipFile.CreateFromDirectory(startPath, zipPath)

        ZipFile.ExtractToDirectory(zipPath, extractPath)
    End Sub

End Module

Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
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Kamal KhaleefaInformation Security SpecialistCommented:
try to Add a reference to this assembly: System.IO.Compression.FileSystem
Lokesh B RDeveloperCommented:

Add the Reference to System.IO.Compression.FileSystem

1. Right click on the References
2. Add References
3. Select System.IO.Compression.FileSystem
4 Click Ok
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
As I said in my question " I tried to add a reference to Imports System.IO.Compression
 but can't find it."
What could cause this?
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Fernando SotoRetiredCommented:
Hi murbro;

Having .Net Framework 4.5 on your system does not mean that your project is being compiled with .Net 4.5. You may have multiple .Net Framework's installed but is your project being compiled under 4.5? To see if your project is being compiled with .Net Framework 4.5 or higher as required for ZipFile class go to the projects property page and you should see it on the Application Tab, Note my .Net project is set for 4.0 which does not have ZipFile class but if I set it to 4.5 I then have access to ZipFile class.

Property page

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Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Great answer. As always! Thanks
Fernando SotoRetiredCommented:
Not a problem murbro, glad to help.
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