using System;
using System.Linq;
using System.Collections.Generic;
using using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;

namespace imgmanage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void menuItem1_Click(object sender, EventArgs e)
        {
            
             
        }

        private void menuItem2_Click(object sender, EventArgs e)
        {

            Color c1 = new Color();
            Color c2 = new Color();
            Color c3 = new Color();
            Color c4 = new Color();

            int rr, gg, bb, r1, r2, r3, r4, fxr, fyr, i, j;
            int g1, g2, g3, g4, fxg, fyg, b1, b2, b3, b4, fxb, fyb;

            Bitmap box1 = new Bitmap(pictureBox1.Image);

            for (i = 0; i < pictureBox1.Image.Width - 2; i++)
            {
                for (j = 0; j < pictureBox1.Image.Height - 2; j++)
                {
                    c1 = box1.GetPixel(i, j);
                    c2 = box1.GetPixel(i + 1, j + 1);
                    c3 = box1.GetPixel(i + 1, j);
                    c4 = box1.GetPixel(i, j + 1);

                    r1 = c1.R;
                    r2 = c2.R;
                    r3 = c3.R;
                    r4 = c4.R;

                    fxr = r1 - r2;
                    fyr = r3 - r4;
                    rr = Math.Abs(fxr) + Math.Abs(fyr) + 128;

                    if (rr < 0) rr = 0;
                    if (rr > 255) rr = 255;

                    g1 = c1.G;
                    g2 = c2.G;
                    g3 = c3.G;
                    g4 = c4.G;

                    fxg = g1 - g2;
                    fyg = g3 - g4;

                    gg = Math.Abs(fxg) + Math.Abs(fyg) + 128;

                    if (gg < 0) gg = 0;
                    if (gg > 255) gg = 255;

                    b1 = c1.B;
                    b2 = c2.B;
                    b3 = c3.B;
                    b4 = c4.B;

                    fxb = b1 - b2;
                    fyb = b3 - b4;
                    bb = Math.Abs(fxb) + Math.Abs(fyb);

                    if (bb < 0) bb = 0;
                    if (bb > 255) bb = 255;

                    Color cc = Color.FromArgb(rr, gg, bb);
                    box1.SetPixel(i, j, cc);


                }

                pictureBox1.Refresh();
                pictureBox1.Image = box1;

            }

        }

      [b]  private void menuItem7_Click(object sender, EventArgs e)
        {
            Graphics g = this.pictureBox1.CreateGraphics();
            string path = @"E:\淘宝网店素材搜集\装修图片\bird.bmp";

            Bitmap bitmap = new Bitmap(path);

            float[][]  matrixItems ={ 
                                    new float[]{1,0,0,0,0,},
                                    new float[]{0,1,0,0,0 },
                                    new float[]{0,0,1,0,0 },
                                    new float[]{0,0,0,1,0 },
                                    new float[]{0,0,0,0,1 }};

            ColorMatrix colorMatrix = new ColorMatrix(matrixItems);
            ImageAttributes imageAtt = new ImageAttributes();
            imageAtt.SetColorMatrix(
               colorMatrix, 
              ColorMatrixFlag.Default,
              ColorAdjustType.Bitmap);

     

            int iWidth = bitmap.Width;
            int iHeight = bitmap.Height;

            g.DrawLine( new Pen(Color.Black,25),
                        new Point(10,35),
                        new Point(200,35));


            g.DrawImage(bitmap,new Rectangle(30,0,iWidth,iHeight),0,0,iWidth,iHeight,GraphicsUnit.Pixel,imageAtt);
            
        }
        }


    }

出现如下错误：
错误    1    找不到类型或命名空间名称“ColorMatrix”(是否缺少 using 指令或程序集引

错误    2    找不到类型或命名空间名称“ColorMatrix”(是否缺少 using 指令或程序集引用?)   

错误    3    “System.Drawing.Imaging.ImageAttributes”不包含“SetColorMatrix”的定义，并且找不到可接受类型为“System.Drawing.Imaging.ImageAttributes”的第一个参数的扩展方法“SetColorMatrix”(是否缺少 using 指令或程序集引用?)

错误    4    当前上下文中不存在名称“ColorMatrixFlag”   
错误    5    当前上下文中不存在名称“ColorAdjustType”   
错误    6    “DrawLine”方法没有采用“3”个参数的重载   

我的空间引用没问题啊，怎么还出现这些问题，我的开发平台是visual studio 2008 用的是windows mobile 6.0 sdk
希望有高手指点迷津