I have a paint component in my windows form C# program, How can i recall this method? See attached code.?

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;


using System.Drawing.Drawing2D;





namespace WindowsFormsApplication1


{


public partial class Form1 : Form


{


public Form1()


{


InitializeComponent();


}





private void onPaint(object sender, PaintEventArgs e)


{


Graphics g = e.Graphics;





Brush yel = new SolidBrush(Color.Yellow);


Brush grn = new SolidBrush(Color.Green);


Brush blu = new SolidBrush(Color.SkyBlue);





Rectangle sun = new Rectangle(Width-100,15 , 80, 80);


Rectangle grass = new Rectangle(0, 300, Width, Height);


Rectangle sky = new Rectangle(0, 0, Width, Height);








g.FillRectangle(blu, sky);


g.FillRectangle(grn, grass);


g.FillEllipse(yel, sun);

I have a paint component in my windows form C# program, How can i recall this method? See attached code.?
A simple way would be to break paint out into its own function (with a graphics object as a parameter) then call it with either e.Graphics (from onPaint) or with Form1.CreateGraphics() (from whatever function).