private void btnSalir_Click(object sender, EventArgs e)
        {
            Main_Menu oMainMenu = new Main_Menu(1);

            this.Close();
            oMainMenu.Focus();
        }
 private void btnLogin_Click(object sender, EventArgs e)
 {
     if (client.VerifyUsers(txtUsername.Text, txtPassword.Text) == 1)
     {
         MessageBox.Show("Bienvinido " + txtUsername.Text, "SUCCESS", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
         Main_Menu main = new Main_Menu(1);
         main.Show();
         this.Hide();
     }
     else
     {
         MessageBox.Show("Bienvinido " + txtUsername.Text, "SUCCESS", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
         Main_Menu main = new Main_Menu(0);
         main.Show();
         this.Hide();
     }
 }