private void loginbtn_Click(object sender, EventArgs e)
 {
     if (usercmbx.SelectedValue.Equals(passwordtxt.Text))
     {
         appusers u = (appusers)usercmbx.SelectedItem;
         if (u.usertype.Equals(true))
         {
             MessageBox.Show("welcome!", "administrator", MessageBoxButtons.OK, MessageBoxIcon.Information);
             mainA ventana = new mainA(username);
             ventana.Show();
             this.Hide();
         }
         else
         {
             MessageBox.Show("welcome!", "user", MessageBoxButtons.OK, MessageBoxIcon.Information);
             username = u.username;
             mainB ventana = new mainB(username);
             ventana.Show();
             this.Hide();
         }
     }
     else
     {
         MessageBox.Show("wrong password", "HugoApp", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
     }
 }
        public static List <appusers> getList()
        {
            string sql = "select * from appuser";

            DataTable dt = conexion.makeconsult(sql);

            List <appusers> lista = new List <appusers>();

            foreach (DataRow fila in dt.Rows)
            {
                appusers u = new appusers();
                u.idUser   = Convert.ToInt32(fila[0].ToString());
                u.fullname = fila[1].ToString();
                u.username = fila[2].ToString();
                u.password = fila[3].ToString();
                u.usertype = Convert.ToBoolean(fila[4].ToString());
                lista.Add(u);
            }
            return(lista);
        }