求教！如何解决Graphics缺少 using 指令或程序集引用以及如何通过PictureBox显示图像

下面的这段代码要实现的功能为读取.dat文件并转化为图像，在PictureBox中画出图像。现在的问题是：1.已经添加using System.Drawing，但报错“System.EventArgs”不包含“Graphics”的定义，并且找不到可接受类型为“System.EventArgs”的第一个参数的扩展方法“Graphics”(是否缺少 using 指令或程序集引用?)；2.没有添加PictureBox按钮时能正常读取数据，但是显示不出图像。求各位前辈指点一下！
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private ushort pixel;
        private byte pix;
        private int lngWidthIrImage = 0;
        private int lngHeightIrImage = 0;
        private Bitmap bmp = null;
        private List<float> maxList;
        private List<float> minList;
        private int lngMinPixelValue;
        private int lngMaxPixelValue;
        private int lngSpan;
        public Form1()
        {
            InitializeComponent();
        }
        private void 打开DATtoolStripMenuItem1Click(object sender, EventArgs e)
        {
            try
            {                List<float[,]> mytemperature = new List<float[,]>();
                // if (!FileManager.OpenDatFile(mySeqData))
                if (!OpenDatFileByByte(mytemperature))
                {
                    MessageBox.Show("读取失败");
                    mytemperature = null;
                }
                else
                {
                    MessageBox.Show("读取成功");                    Float2Bitmap(mytemperature[1], bmp);
                
                    //Graphics g = this.CreateGraphics();
                    //g.DrawImage(bmp,240,320);
                }
            }
            catch (Exception ex)
            {            }
        }        private void 显示图像ToolStripMenuItem_Click(object sender, EventArgs e)
        {
             try
             {
                 //Float2Bitmap(mytemperature[1], bmp);
                 PictureBox.Image = System.Drawing.Image.FromHbitmap(bmp.GetHbitmap());
                 Graphics g = e.Graphics;
                 Pen p = new Pen(Color.Red, 2);
                 g.DrawLine(p, 0, 0, 100, 100);
             }
             catch (Exception ex)
             {             }
        }
        public static bool OpenDatFileByByte(List<float[,]>mytemperature)
         {
             OpenFileDialog openFileDlg = new OpenFileDialog();
             openFileDlg.Filter = "*.dat|*.DAT|*.*|*.*";
             openFileDlg.Title = "选择序列文件";
             openFileDlg.Multiselect = false;
             string fileName;
             if (openFileDlg.ShowDialog() != DialogResult.OK)
             {
                 return false;
             }
             fileName = openFileDlg.FileName;
             using (FileStream s = new FileStream(fileName, FileMode.Open, FileAccess.Read))
             {
                 byte[] buffer = new byte[s.Length];
                 s.Read(buffer, 0, buffer.Length);
                 if (ReadBinaryBuffer(buffer,mytemperature))
                 {
                     //mytemperature.FileName = fileName;
                     return true;
                 }
                 else
                 {
                     return false;
                 }
             }
         }
        /////
        private static bool ReadBinaryBuffer(byte[] buffer, List<float[,]> mytemperature)
        {
            int width=320;
            int height=240;            if (!ReadBinaryBufferByInt16(height, width, sizeof(Int16), buffer, mytemperature))
            {
                return false;
            }
            return true;     
            //seqData.Width = width;
            //seqData.Height = height;
            //seqData.Frame = seqData.TemperatureList.Count;
            
        }        private static bool ReadBinaryBufferByInt16(int height, int width, int sizeOfType, byte[] buffer, List<float[,]> listFloatArr)
        {
            listFloatArr.Clear();
            int length = width * height;
            int frame = buffer.Length / (length * sizeOfType);
            int remainder = buffer.Length % (length * sizeOfType);
            int pos = 0;
            if (0 != remainder)
            {
                return false;
            }
            try
            {
                for (int f = 0; f < frame; f++)
                {
                    float[,] tmpFrame = new float[width, height];
                    for (int h = 0; h < height; h++)
                    {
                        for (int w = 0; w < width; w++)
                        {
                            tmpFrame[w, h] = ((float)BitConverter.ToInt16(buffer, pos)) / 100.0f;
                            pos += sizeOfType;
                        }
                    }
                    listFloatArr.Add(tmpFrame);
                }
                
            }
            catch (ArgumentOutOfRangeException e)
            {
                return false;
            }
            return true;
        }
        
        
       
       
        
         protected virtual void Float2Bitmap(float[,] im, Bitmap bmp)
        {
            // We have an image - cast it to proper type
           
            //获得从相机采集到的图片的长宽            lngWidthIrImage = im.GetLength(0);
            lngHeightIrImage = im.GetLength(1);            // Find minimum and maximum pixels
            float lngMinPixelValue = 65535;
            float lngMaxPixelValue = 0;
            for (int y = 0; y < lngHeightIrImage; y++)
            {
                for (int x = 0; x < lngWidthIrImage; x++)
                {
                    float pixel = im[x, y];                    if (pixel < lngMinPixelValue)
                        lngMinPixelValue = pixel;
                    else if (pixel > lngMaxPixelValue)
                        lngMaxPixelValue = pixel;
                }
            }            float lngSpan = lngMaxPixelValue - lngMinPixelValue;
            maxList.Add(lngMaxPixelValue);
            minList.Add(lngMinPixelValue);            // Convert 16-bit pixels to color values and fill bitmap
            for (int y = 0; y < lngHeightIrImage; y++)
            {
                for (int x = 0; x < lngWidthIrImage; x++)
                {
                    float pixel = (float)im[x, y];
                    byte pix = (byte)(((pixel - lngMinPixelValue) * 255) / lngSpan);
                    bmp.SetPixel(x, y, Color.FromArgb(pix, pix, pix));
                }
            }
            //PictureBox.Image = System.Drawing.Image.FromHbitmap(bmp.GetHbitmap());
        }        /*
        private void Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {            if (mytemperature[1] != null)
            {                Graphics g = e.Graphics;                g.DrawImage(mytemperature[1], newRectangle(this.AutoScrollPosition.X, this.AutoScrollPosition.Y,                (int)(showBitmap.Width), (int)(showBitmap.Height)));            }        }*/    }