private void btnDisconnect_Click(object sender, EventArgs e)
{
client.SendMessage(new Common.Message(MessageTypes.UserJoinOrLeft, client.ID, tbName.Text, tbName.Text + " left the chat", false));
client.CloseClient();
btnDisconnect.Enabled = false;
btnConnect.Enabled = true;
tbIPAddress.ReadOnly = false;
tbName.ReadOnly = false;
tbPort.ReadOnly = false;
btnSend.Enabled = false;
tbMessages.Clear();
lbUsers.Items.Clear();
cbMsgToAll.Checked = true;
cbMsgToAll.Enabled = false;
}