C# paint program

gistfile1.txt

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        bool shouldPaint = false;
        public Form1()
        {
            InitializeComponent();
        }

 
        private void Form1_MouseDown(object sender, MouseEventArgs x) { shouldPaint= true; }
        private void Form1_MouseUp(object sender, MouseEventArgs x) { shouldPaint = false; }
        private void Form1_MouseMove(object sender, MouseEventArgs x) { if (shouldPaint) { using (Graphics graphics = CreateGraphics()) { graphics.FillEllipse(new SolidBrush(Color.BlueViolet), x.X, x.Y, 4, 4); } } }
    }
}