Getting pixel vale at runtime using mouse click event

Try this
Add picturebox and label to form

code:

public partial class Form1 : Form
    {
        Bitmap mybitmap;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            loadImage();
        }


        public void loadImage()
        {
            Image img = Image.FromFile("head1.png");//use your own image
            mybitmap = new Bitmap(img.Width, img.Height);
            Graphics g = Graphics.FromImage(mybitmap);
            g.DrawImage(img, 0, 0);
            img.Dispose();
            pictureBox1.Image = mybitmap;
        }

   

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {

            Color pixelColor = mybitmap.GetPixel(e.X, e.Y);
            label1.BackColor = pixelColor;
        }
    }