show cross on jpg in picturebox

[mrcw]

Hi

I have drawn a cross to show in a picturebox in front of a jpg which should show when the button is pressed.

If I comment out the image line the cross shows
If I comment out the cross code the image shows
but i can't paint the image with the cross in front of it
can somebody tell/show me where I'm goig wrong

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            pictureBox1.Image = Image.FromFile("C:/Users/main/Desktop/Image.jpg");
            Graphics g1 = pictureBox1.CreateGraphics();
            Pen myPen1 = new Pen(Color.Green);
            myPen1.Width = 2;
            g1.DrawLine(myPen1, 113, 80, 133, 80);
            g1.DrawLine(myPen1, 123, 70, 123, 90);
        }
    }
}

[mrcw]

why can't I see the jpg and the cross?

thanx

mrcw

[Rabbit]

That's because the CreateGraphics method creates a new graphic and replaces what's there previously. What you want to do is create a graphic from an existing image using the FromImage method and then draw on top of that.

[mrcw]

thanx for your help
mark