非常简单的c#访问修饰符VS形式

这是针对VS中的windows窗体的。它表示"newpic"在当前上下文中不存在。我尝试使用load事件处理程序方法或您调用的任何方法将访问修饰符设置为public。但这对我没有帮助。我确信这是我不知道的简单事情。如果我能把"newpic"保存在"资源"中，那就太好了

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;
namespace flexland
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public void Form1_Load(object sender, EventArgs e)
        {
            Bitmap bmp=new Bitmap(Properties.Resources.pic1in);
            Bitmap newpic = new Bitmap(bmp);
            int width=bmp.Width;
            int height=bmp.Height;
            Color c=default(Color);
            byte t=10;
            byte t2=10;
            byte rc=50;
            byte gc=50;
            byte bc=50;
            byte rs=10;
            byte gs=10;
            byte bs=10;
            byte rc2=100;
            byte gc2=100;
            byte bc2=100;
            byte rs2=100;
            byte gs2=100;
            byte bs2=100;
            byte rs3=200;
            byte gs3=200;
            byte bs3=200;
            for(int y=0; y<height; y++)
            {
                for(int x=0; x<width; x++)
                {   
                    c=bmp.GetPixel(x, y);
                    byte a=c.A;
                    byte r=c.R;
                    byte g=c.G;
                    byte b=c.B;
                    int rl=rc-t;
                    int rh=rc+t;
                    int gl=gc-t;
                    int gh=gc+t;
                    int bl=bc-t;
                    int bh=bc+t;
                    int  rl2=rc2-t2;
                    int  rh2=rc2+t2;
                    int  gl2=gc2-t2;
                    int gh2=gc2+t2;
                    int  bl2=bc2-t2;
                    int bh2=bc2+t2;
                    if((r>rl&&r<rh)&&(r>rl&&r<rh)&&(b>bl&&b<bh))
                    {
                        newpic.SetPixel(x, y, Color.FromArgb(a, rs, gs, bs));
                    }
                    else if((r>rl&&r<rh)&&(r>rl&&r<rh)&&(b>bl&&b<bh))
                    {
                        newpic.SetPixel(x, y, Color.FromArgb(a, rs2, gs2, bs2));
                    }
                    else
                    {
                        newpic.SetPixel(x, y, Color.FromArgb(a, rs3, gs3, bs3));
                    }
                }
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            ictureBox1.Image =newpic; ////******PROBLEM*****newpic red underline
        }
    }
}

 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;
 namespace flexland
 {
     public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }
         Bitmap newpic; //Put newpic here!
         public void Form1_Load(object sender, EventArgs e)
         {
             Bitmap bmp = new Bitmap(Properties.Resources.pic1in);
             newpic = new Bitmap(bmp); //don't declare newpic here!
             .... //all other initializations
         }
         private void button1_Click(object sender, EventArgs e)
         {
             pictureBox1.Image = newpic; //It should fix the problem
         }       
     }
 }