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Image newImage1 = Image.FromFile("C:\\Background_medium.jpg");
Rectangle destRect = new Rectangle(1, 1, 10000, 10000);
Bilder.DrawImage(newImage, destRect);					

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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        private Graphics Bilder;
        private PictureBox pb = new PictureBox();


        public Form1()
        {
            InitializeComponent();
            Bilder = this.CreateGraphics();
            
        }

                    
        private void Form1_Load(object sender, EventArgs e)
        {
           
            pb.Paint += new System.Windows.Forms.PaintEventHandler(this.pb_Paint);
            this.Controls.Add(pb);
            pb.Width = 1760;
            pb.Height = 1200;
        }
          

        private void pb_Paint(object sender, PaintEventArgs e)
        {
            
            Image newImage = Image.FromFile("C:\\Background_medium.jpg");
            Rectangle destRect = new Rectangle(1, 1, 10000, 10000);
            Bilder.DrawImage(newImage, destRect); 
        }
    }
}