Converting a class with a property of T to and from json - vb.net

Question

I have a class (MyMessage) which have a property called "Settings" of Type T.
I need to convert MyMessage to json, send it via TCP and when I recieve it, I need to test what class Type T is and then convert the recieved json to the MyMessage Of T class.
This is my code so far - function SendMessage and MessageRecieved is not working ... and I need your help :)...
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Dim t As New MyMessage(Of MyMessageSettingsText)
t.Settings.Text = "Yes"
Call SendMessage(t)
Dim n As New MyMessage(Of MyMessageSettingsNumber)
n.Settings.Number = 1
Call SendMessage(n)
End Sub
Private Sub SendMessage(msg As MyMessage)
Dim json As String = Newtonsoft.Json.JsonConvert.SerializeObject(msg)
' Do send using tcp etc
End Sub
Private Sub MessageRecieved(msgJson As String) ' A json string recived from a tcp server
Dim msg As MyMessage = DirectCast(Newtonsoft.Json.JsonConvert.DeserializeObject(Of MyMessage)(msgJson), MyMessage)
If TypeOf (msg.Settings) Is MyMessageSettingsText Then
Dim t As MyMessage(Of MyMessageSettingsText) = CType(msg, MyMessage(Of MyMessageSettingsText))
' do something with t
End If
End Sub
End Class
Public MustInherit Class MyMessageSettingsBase
End Class
Public Class MyMessageSettingsText
Inherits MyMessageSettingsBase
Public Property Text As String
End Class
Public Class MyMessageSettingsNumber
Inherits MyMessageSettingsBase
Public Property Number As Integer
End Class
Public Class MyMessage(Of T As {New})
Public Property Name As String
Public Property Settings As New T
End Class