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Dim mlis As New System.Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork, _
Net.Sockets.SocketType.Dgram, Net.Sockets.ProtocolType.Udp)
.................
Dim buffer(1024) As Byte
Dim svr As New IPEndPoint(IPAddress.Any, 0)
mlis.BeginReceiveFrom(buffer, 0, 1024, 0, _
svr, New AsyncCallback(AddressOf ReadCallback), state)