Check linked list is circular or not in vb.net

Vb program for Check linked list is circular or not . Here more information.

' Include namespace system
Imports System 
'  Vb.net Program for
'  Check linked list is circular or not

'  Define class of linked list Node
Public Class LinkNode 
    Public  data As Integer
    Public  [next] As LinkNode
    Public Sub New(ByVal data As Integer)
        Me.data = data
        Me.next = Nothing
    End Sub
End Class

public Class LinkedList 
    Public  head As LinkNode
    '  Class constructor
    Public Sub New()
        Me.head = Nothing
   
    End Sub
    '  Check circular linked list or not
    '  Note that this function is not capable to detect loop
    Public Function  isCircular() As Boolean
        if (Me.head  Is  Nothing) Then 
            '  Case when linked list is empty
            Return False
        Else 
            Dim temp As LinkNode = Me.head
            
            while (temp IsNot Nothing) 
                '  Visit to next node
                temp = temp.[next]
                if (temp  Is  Me.head) Then 
                    '  When detecting circular node
                    Return True
                End If

            End While
            '  When not circular linked list
            Return False
        End IF

    
    End Function 
    
    Public Shared Sub Main(ByVal args As String())
        Dim ll As LinkedList = New LinkedList()
        '  insert element of linked list
        ll.head = New LinkNode(1)
        ll.head.[next] = New LinkNode(2)
        ll.head.[next].[next] = New LinkNode(3)
        ll.head.[next].[next].[next] = New LinkNode(4)
        ll.head.[next].[next].[next].[next] = New LinkNode(5)
        if (ll.isCircular()) Then 
            Console.WriteLine("Yes")
        Else 
            Console.WriteLine("No")
        End IF

        '  Connect last node to head
        ll.head.[next].[next].[next].[next].[next] = ll.head
        if (ll.isCircular()) Then 
            Console.WriteLine("Yes")
        Else 
            Console.WriteLine("No")
        End IF

    
    End Sub

End Class

Output

No
Yes