Vb.net read msg from server with imap and ssl 456

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application

In a vb application, i wanna connect via imap to a server with ssl and download new messages from an account, i was trying with Net but it doesn't allow ssl protocol, how can i?
Thanks.

What I have tried:

Private Sub InitializeConnection(ByVal hostname As String, ByVal port As String)
     Try
         _imapClient = New TcpClient(hostname, port)
         _imapNs = _imapClient.GetStream()
         _imapSw = New StreamWriter(_imapNs)
         _imapSr = New StreamReader(_imapNs)
     Catch ex As Exception
         MsgBox(ex.Message)
     End Try
 End Sub
 Private Function Response() As String
     Try
         Dim data(_imapClient.ReceiveBufferSize) As Byte
         Dim ret As Integer = _imapNs.Read(data, 0, data.Length)
         Return System.Text.Encoding.ASCII.GetString(data)
     Catch ex As Exception
         MsgBox(ex.Message)
     End Try
 End Function

The error is when i try an ssl authentiation, with port 25 it works.