vb.net 模拟UDP通信

Imports System.Net
Imports System.Text.Encoding

Public Class Form1
    Dim publisher As New Sockets.UdpClient(0)
    Dim subscriber As New Sockets.UdpClient(2000)



    Private Sub Timer1_Tick_1(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Timer1.Tick
        Try
            Dim ep As IPEndPoint = New IPEndPoint(IPAddress.Any,0)
            Dim rcvbytes() As Byte = subscriber.Receive(ep)
            TextBox4.Text = ASCII.GetString(rcvbytes)
        Catch ex As Exception
        End Try
    End Sub

    Private Sub Form1_Load_1(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load
        subscriber.Client.ReceiveTimeout = 100
        subscriber.Client.Blocking = False
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        publisher.Connect(TextBox1.Text,TextBox2.Text)
        Dim sendbytes() As Byte = ASCII.GetBytes(TextBox3.Text)
        publisher.Send(sendbytes,sendbytes.Length)
    End Sub
End Class