How to draw pixels in color red on the image in pictureBox1 in real time on mouse move event?

Question

i'm trying to draw pixels in red color while moving the mouse so where the mouse cursor is inside the pictureBox1 draw at that point a pixel.

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            pictureBox1.Image = Properties.Resources._image;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
           
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            label1.Text = String.Format("X: {0}; Y: {1}", e.X, e.Y);

            Bitmap bmp = new Bitmap(pictureBox1.Image);

            for(int x = 0; x < bmp.Width; x++)
            {
                for(int y = 0; y < bmp.Height; y++)
                {
                    bmp.SetPixel(e.X, e.Y, Color.Red);
                }
            }

            bmp.Dispose();
        }

this is very slow and not drawing pixels in red.

Answer 1

This is working in the mouse move event:

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            label1.Text = String.Format("X: {0}; Y: {1}", e.X, e.Y);
            Bitmap bmp = new Bitmap(pictureBox1.Image);
            bmp.SetPixel(e.X, e.Y, Color.Red);
            pictureBox1.Image = bmp;
        }