Control Timer is not work ??

[C# Programming]

Here the code programing network about receive message

private void Received(IAsyncResult iar)
{
NetworkStream ns = (NetworkStream)iar.AsyncState;
int byteRead = ns.EndRead(iar);
String sReply = Encoding.ASCII.GetString(m_byteData,0,byteRead);
String sProtocol = sReply.Substring(0, 8);

switch (sProtocol)
{
case "GETPRES ":
////code is not work
if(timerSendMonitorDesktop.Enabled ==false)
timerSendMonitorDesktop.Enabled = true;
////
break;
}
}

private void timerSendMonitorDesktop_Tick(object sender, EventArgs e)
{
MessageBox.Show("abc");
}



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