public partial class frmDemo : Form
    {
        private EasyDAClient _easyDAClient = new EasyDAClient();
        private float MyValue;
        public frmDemo()
        {
            InitializeComponent();
            _easyDAClient.SubscribeItem("", "My.Server.Name", "My.Tag", 50, (s, e) => MyValue = (float)e.Vtq.Value);
        }
 
        private void frmDemo_Load(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }
 
        private void timer1_Tick(object sender, EventArgs e)
        {
            textBox1.Text = MyValue.ToString();
        }
    }