UDPclient buffer too small - vb.net

Question

Hello to all I am developing an application that needs to send a image via the UDP socket.I know that TCP is a better protocol,but playing with Kryonet in Java I have learnt that UDP is better for this type of application.I have this small class that I have made:
Imports System.Net.Sockets
Imports System.Net
Imports System.Text.Encoding
Public Class BasicUDPClient
Event ClientMessageReceived(ByVal msg() As Byte)
Public Property HostName As String = "localhost"
Public Property Port As Integer = 8991
Dim sender As New UdpClient(0)
Dim receiver As New UdpClient(Port)
Dim th_recv As New Threading.Thread(AddressOf Receive)
Dim run As Boolean
Dim ep As New IPEndPoint(System.Net.IPAddress.Any, 0)
Public Sub New(ByVal host As String, ByVal port As Integer)
HostName = host
Me.Port = port
receiver.Client.Blocking = False
'10485760 = 10MB
receiver.Client.ReceiveBufferSize = 10485760
sender.Client.SendBufferSize = 10485760
receiver.Client.ReceiveTimeout = 5000
StartReceive()
End Sub
Public Sub SendString(ByVal msg As String)
SendMessage(UTF8.GetBytes(msg))
End Sub
Public Sub SendMessage(ByVal msg() As Byte)
sender.Connect(HostName, Port)
sender.Send(msg, msg.Length)
End Sub
Public Sub StartReceive()
run = True
th_recv = New Threading.Thread(AddressOf Receive)
th_recv.Start()
End Sub
Public Sub StopReceive()
run = False
End Sub
Private Sub Receive()
While (run)
Try
RaiseEvent ClientMessageReceived(receiver.Receive(ep))
Catch ex As Exception
Debug.WriteLine("Error: " & ex.Message)
End Try
End While
End Sub
End Class
It works great with string likes hello,but when I am sending the image,about 200000-150000 bytes I got an error saying that the buffer is lower than the contents of the packet (I can post an image of the error message,but my .net language is in Spanish)
Thanks

Answer 1

With UDP you cannot send messages bigger than 64KB. Use TCP, or split the payload yourself into multiple messages which will be extremely complex because messages can be lost.
ReceiveBufferSize is not what you think it is. It almost never helps to use it.
Code for sender and receiver is missing but sender.Connect looks strange given that UDP is connectionless.