using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
 
public class HelloForm : Form
{
    private Device device_;
    private PresentParameters presentParam_;
    private Microsoft.DirectX.Direct3D.Font font_;
 
    public HelloForm()
    {
        this.Size = new Size(640, 480);
        this.Text = "Hello, World!";
    }
 
    public bool InitD3D()
    {
        presentParam_ = new PresentParameters();
 
        presentParam_.Windowed = true;
        presentParam_.SwapEffect = SwapEffect.Discard;
 
        device_ = new Device(0, DeviceType.Hardware, this, CreateFlags.HardwareVertexProcessing, presentParam_);
 
        InitFont();
 
        return true;
    }
 
    private void InitFont()
    {
        FontDescription fd = new FontDescription();
 
        fd.Height = 16;
        fd.FaceName = "ＭＳ ゴシック";
 
        font_ = new Microsoft.DirectX.Direct3D.Font(device_, fd);
    }
 
    public void Render()
    {
        if (device_ == null)
        {
            return;
        }
 
        device_.Clear(ClearFlags.Target, Color.Blue, 1.0f, 0);
        device_.BeginScene();
 
        font_.DrawText(null, "Hello, DirectX(C#) World!", 10, 10, Color.White);
 
        device_.EndScene();
        device_.Present();
    }
 
    [STAThread]
    public static void Main()
    {
        using (HelloForm form = new HelloForm())
        {
            form.InitD3D();
            form.Show();
 
            while (form.Created)
            {
                form.Render();
                Application.DoEvents();
            }
        }
    }
}

C:¥> csc ^
    /target:winexe ^
    /platform:x86 ^
    /r:"C:WindowsMicrosoft.NETDirectX for Managed Code1.0.2902.0Microsoft.DirectX.dll" ^
    /r:"C:WindowsMicrosoft.NETDirectX for Managed Code1.0.2902.0Microsoft.DirectX.Direct3D.dll" ^
    /r:"C:WindowsMicrosoft.NETDirectX for Managed Code1.0.2911.0Microsoft.DirectX.Direct3DX.dll" ^
    Hello.cs

+------------------------------------------+
|Hello, World!                    [_][~][X]|
+------------------------------------------+
|Hello, DirectX(C#) World!                 |
|                                          |
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|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
|                                          |
+------------------------------------------+