public Form1()
{
InitializeComponent();
cancellationTokenSource = new CancellationTokenSource();
token = cancellationTokenSource.Token;
proxy = new ChatServiceReference.ChatContractClient();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (userID != 0 && sessionID != 0)
{
proxy.Exit(userID, sessionID);
}
proxy.Close();
proxy = null;
cancellationTokenSource.Cancel();
cancellationTokenSource.Dispose();
}