how to stop flickering C# winforms

Question

I have a program that is essentially like a paint application. However, my program has some flickering issues. I have the following line in my code (which should get rid of

Answer 1

here is the program of moving circle in .net, that doesn't flicker.

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
namespace CircleMove
{
    /// 

    /// Description of MainForm.
    /// 
    public partial class MainForm : Form
    {
        int x=0,y=0;
        Thread t;

        public MainForm()
        {

            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();

            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
        }
        void MainFormPaint(object sender, PaintEventArgs e)
        {
            Graphics g=e.Graphics;
            Pen p=new Pen(Color.Orange);
            Brush b=new SolidBrush(Color.Red);
        //  g.FillRectangle(b,0,0,100,100);
            g.FillEllipse(b,x,y,100,100);
        }
        void MainFormLoad(object sender, EventArgs e)
        {
            t=new Thread(  new ThreadStart(

                ()=>{
                    while(true)
                    {
                        Thread.Sleep(10);
                        x++;y++;
                        this.Invoke(new Action(
                            ()=>{

                                this.Refresh();
                                this.Invalidate();
                                this.DoubleBuffered=true;
                                }
                                            )
                                        );
                    }
                    }
                                            )

                        );

            t.Start();
        }
    }
}