Code Target

To display the image, we will copy all the information to the Video RAM and then order Direct3D to copy the data to the back buffer. 

Now we need to create the vertices using our new format. We can build an actual vertex using our new CustomVertex. This results in a triangle, which we will see drawn on the screen shortly.
 
Now we need to get that triangle ready for Direct3D to use. To do this, we create what is called a vertex buffer.
 
A vertex buffer is simply an interface that stores a section in memory (either Video RAM or system memory) to holds information about the vertices/models in your game. The name is self-explanatory. We specify the size of our vertices.

Now that we have told Direct3D what kind of vertices we are using and where to get them from, we tell it to draw the vertices we have built. This function draws the primitives in the selected vertex buffer to the screen. Finally we use the Present() method of Direct3D.Device to present the contents of the next buffer in the sequence of back buffers owned by the device.
 
Solution:
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
namespace GP_P2
{
public partial class Form1 : Form
{
Microsoft.DirectX.Direct3D.Device device;
public Form1()
{
InitializeComponent();
InitDevice();
}
private void InitDevice()
{
PresentParameters pp = new PresentParameters();
pp.Windowed = true;
pp.SwapEffect = SwapEffect.Discard;
device = new Device(0, DeviceType.Hardware, this,
CreateFlags.HardwareVertexProcessing, pp);
}
private void Render()

{
CustomVertex.TransformedColored[] vertexes = new
CustomVertex.TransformedColored[3];
vertexes[0].Position = new Vector4(240, 110, 0, 1.0f);//first point
vertexes[0].Color = System.Drawing.Color.FromArgb(0, 255, 0).ToArgb();
vertexes[1].Position = new Vector4(380, 420, 0, 1.0f);//second point
vertexes[1].Color = System.Drawing.Color.FromArgb(0, 0, 255).ToArgb();
vertexes[2].Position = new Vector4(110, 420, 0, 1.0f);//third point
vertexes[2].Color = System.Drawing.Color.FromArgb(255, 0, 0).ToArgb();
device.Clear(ClearFlags.Target, Color.CornflowerBlue, 1.0f, 0);
device.BeginScene();
device.VertexFormat = CustomVertex.TransformedColored.Format;
device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, vertexes);
device.EndScene();
device.Present();
}
private void Form1_Load(object sender, EventArgs e) { }
private void Form1_Paint(object sender, PaintEventArgs e)
{
Render();
}
}
}
Ot
 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;
namespace GP_P2
{
public partial class Form1 : Form
{
Microsoft.DirectX.Direct3D.Device device;
public Form1()
{
InitializeComponent();
InitDevice();
}
private void InitDevice()
{
PresentParameters pp = new PresentParameters();
pp.Windowed = true;
pp.SwapEffect = SwapEffect.Discard;
device = new Device(0, DeviceType.Hardware, this,
CreateFlags.HardwareVertexProcessing, pp);
}
private void Render()

{
CustomVertex.TransformedColored[] vertexes = new
CustomVertex.TransformedColored[3];
vertexes[0].Position = new Vector4(240, 110, 0, 1.0f);//first point
vertexes[0].Color = System.Drawing.Color.FromArgb(0, 255, 0).ToArgb();
vertexes[1].Position = new Vector4(380, 420, 0, 1.0f);//second point
vertexes[1].Color = System.Drawing.Color.FromArgb(0, 0, 255).ToArgb();
vertexes[2].Position = new Vector4(110, 420, 0, 1.0f);//third point
vertexes[2].Color = System.Drawing.Color.FromArgb(255, 0, 0).ToArgb();
device.Clear(ClearFlags.Target, Color.CornflowerBlue, 1.0f, 0);
device.BeginScene();
device.VertexFormat = CustomVertex.TransformedColored.Format;
device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, vertexes);
device.EndScene();
device.Present();
}
private void Form1_Load(object sender, EventArgs e) { }
private void Form1_Paint(object sender, PaintEventArgs e)
{
Render();
}
}
}

Output: