System Drawing C# by API

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D;
public class Form1 : System.Windows.Forms.Form {
    private void Form1_Paint(object sender,
        System.Windows.Forms.PaintEventArgs p) {
        Graphics g = p.Graphics;
    }
    private void createManually() {
        Graphics g;
        g = this.CreateGraphics();
    }
    private void createFromFile() {
        Graphics g;
        Bitmap b;
        b = new Bitmap("C:\\E.bmp");
        g = Graphics.FromImage(b);
    }
    private void drawLine() {
        Graphics g;
        g = this.CreateGraphics();
        Icon i = new Icon(@"C:\Desktop.ico");
        g.DrawIcon(i, 150, 15);
    }
}