Sending massage to specific client from server in VB.NET

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VB

server

server-side

, +

Currently I'm building a project where I can send Massage to specific connected clients. But when ever I send data it goes to all of the connected client.I've reviewed this code but still confuse how to implement the solution :( .
Server Code

While True
           Dim incoming As TcpClient = Me.MyTcpListener.AcceptTcpClient
           Dim Str As StreamReader = New StreamReader(incoming.GetStream)
          Dim C As New Client
               C.ClientID = Me.ClientID
               C.Str = Str
               C.Start(IncomingConnection)
               Me.ClientList.Add(C)
               RaiseEvent _ClientConnected(C)
               AddHandler C._ClientDisconnect, AddressOf ClientDisconnected
               Me.ClientID += 1
               End While

Note : I found this code a long time ago and i only have it now. The main goal I want to achieve here is to communicate from server to specific client using client_ID.

What I have tried:

Sample of my code..:

Dim server as TCPListener
server.start(9090)
while true
listbox1.Items.Add(server.RemoteEndPoint.Address.toString)
end while