Here is my code:

Code:
Public Function extractZipArchive() As Boolean
    Dim zipPath As String = "c:\example\start.zip"
    Dim extractPath As String = "c:\example\extract"

    Using archive As ZipArchive = ZipFile.OpenRead(zipPath)
        For Each entry As ZipArchiveEntry In archive.Entries
            If entry.FullName.EndsWith(".txt", StringComparison.OrdinalIgnoreCase) Then
                entry.ExtractToFile(Path.Combine(extractPath, entry.FullName))
            End If
        Next
    End Using
End Function
I am importing the following:

Code:
Imports System.IO
Imports System.IO.Compression
I am getting the following error:

Type 'ZipArchive' is not defined.
How can I fix this error?