Need to answers for questions on my Create IIS VD code.

[Wokawidget]

Private Sub CreateVirtualDir(ByVal WebSite As String, ByVal AppName As String, ByVal Path As String)
 
        Dim IISSchema As New System.DirectoryServices.DirectoryEntry("IIS://" & WebSite & "/Schema/AppIsolated")
        Dim CanCreate As Boolean = Not IISSchema.Properties("Syntax").Value.ToString.ToUpper() = "BOOLEAN"
        IISSchema.Dispose()
 
        If CanCreate Then
            Dim PathCreated As Boolean
 
            Try
                'make sure folder exists
                If Not System.IO.Directory.Exists(Path) Then
                    System.IO.Directory.CreateDirectory(Path)
                    PathCreated = True
                End If
 
                'create IIS object
                Dim IISAdmin As New System.DirectoryServices.DirectoryEntry("IIS://" & WebSite & "/W3SVC/1/Root")
 
                'If the virtual directory already exists then delete it
                For Each VD As System.DirectoryServices.DirectoryEntry In IISAdmin.Children
                    If VD.Name = AppName Then
                        IISAdmin.Invoke("Delete", New String() {VD.SchemaClassName, AppName})
                        IISAdmin.CommitChanges()
                        Exit For
                    End If
                Next VD
 
                'Create and setup new virtual directory
                Dim VDir As System.DirectoryServices.DirectoryEntry = IISAdmin.Children.Add(AppName, "IIsWebVirtualDir")
 
                VDir.Properties("Path").Item(0) = Path
                VDir.Properties("AppFriendlyName").Item(0) = AppName
                VDir.Properties("EnableDirBrowsing").Item(0) = False
                VDir.Properties("AccessRead").Item(0) = True
                VDir.Properties("AccessExecute").Item(0) = True
                VDir.Properties("AccessWrite").Item(0) = False
                VDir.Properties("AccessScript").Item(0) = True
                VDir.Properties("AuthNTLM").Item(0) = True
                VDir.Properties("EnableDefaultDoc").Item(0) = True
                VDir.Properties("DefaultDoc").Item(0) = "default.htm,default.aspx,default.asp"
                VDir.Properties("AspEnableParentPaths").Item(0) = True
                VDir.CommitChanges()
 
                'the following are acceptable params
                'INPROC = 0
                'OUTPROC = 1
                'POOLED = 2
                VDir.Invoke("AppCreate", 1)
 
            Catch Ex As Exception
                If PathCreated Then
                    System.IO.Directory.Delete(Path)
                End If
                Throw Ex
            End Try
        End If

This is used like:

CreateVirtualDir("LocalHost", "Woof", "C:\My Web Apps\Woof")

I completely understand all of the code, except for one line:

Dim CanCreate As Boolean = Not IISSchema.Properties("Syntax").Value.ToString.ToUpper() = "BOOLEAN"

Why? What's it checking? All the code I find on the web has this in, but can't figure out what exactly it's there for

Woka