Form

using Microsoft.DirectX.Direct3D;
using System.Drawing;
using System.Windows.Forms;

namespace Direct3D_Course
{
    public partial class Form1 : Form
    {
       private Device device;

        public Form1()
        {
            InitializeComponent();
        }

        public void InitializeDevice()
        {
            PresentParameters presentParams = new PresentParameters();
            presentParams.Windowed = true;
            presentParams.SwapEffect = SwapEffect.Discard;
            device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            device.Clear(ClearFlags.Target, Color.Azure, 1.0f, 0);
            device.Present();
        }
    }
}