C#

public ActionResult Index ()
         {
             CatalogModel m = new CatalogModel ();
             m.LocalCodeColumn = 1;
             m.PriceColumn = 2;
             m.SelectedClientList = m.GetClientSelectedItems ();
             return View (m);
         }

Select Client: @ Html.DropDownListFor (m => m.SelectedClientList, Model.GetClientSelectedItems (), "--Select--", new {@id = "ddlClient"})

public IEnumerable<SelectListItem> GetClientSelectedItems()
        {
            // Function GetListClient() return IEnumerable<SelectListItem> 
            IEnumerable<SelectListItem> listClient = dataServices.GetClients();
            return listClient;
        }

//This is in my form1.cs
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

public partial class Form1 : Form
    {
        private int WindowVx, WindowVy;
        private int WindowX, WindowY;
        private int width = Screen.PrimaryScreen.WorkingArea.Width;
        private int height = Screen.PrimaryScreen.WorkingArea.Height;

 private void timer1_Tick(object sender, EventArgs e)
        {

            WindowX = random.Next(width);
            WindowY = random.Next(height);
            int wx = random.Next(width / 2);
            int wy = random.Next(height / 2);
            WindowVx = random.Next (1, 4);
            WindowVy = random.Next (1, 4);
            this.Left = WindowX;
            this.Top = WindowY;
            this.Width = wx;
            this.Height = wx;
            //form.Show();
            //new Form1().Show();

        }


private void timer4_Tick (object sender, EventArgs e)
        {
            WindowX += WindowVx;
            if (WindowX < 0) {
                WindowVx = -WindowVx;
            } else if (WindowX + width > ClientSize.Width) {
                WindowVx = -WindowVx;
            }


            this.Refresh ();
        }

//The following part is in form1.designer.cs

 this.timer4 = new System.Windows.Forms.Timer (this.components);

            this.timer4.Enabled = true;
            this.timer4.Interval = 1000;
            this.timer4.Tick += new System.EventHandler (this.timer4_Tick);

        private System.Windows.Forms.Timer timer4;