private void btnOK_Click(object sender, EventArgs e)
{
MainMenuForm frm = new MainMenuForm();
frm.Show();
this.Hide();
}
private void rtbMessage_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
MainMenuForm frm = new MainMenuForm();
frm.Show();
this.Hide();
}
}