SampleApp.MainForm.pbTerrain_MouseMove C# (CSharp) Method

        private void pbTerrain_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            Graphics g = Graphics.FromImage(pbTerrain.Image);

            Color c = Color.Yellow;

            if (e.Button == MouseButtons.Left)
                c = Color.White;
            else if (e.Button == MouseButtons.Right)
                c = Color.Black;

            if (c != Color.Yellow)
            {
                g.FillRectangle(new SolidBrush(c), e.X - 40, e.Y - 40, 80, 80);

                LastX = e.X;
                LastY = e.Y;

                g.DrawImage(pbTerrain.Image, 0, 0);
                OriginalMap = CopyImage(pbTerrain.Image as Bitmap);
                pbTerrain.Refresh();
                g.Dispose();
            }

        }