openFileDialogue Bitmaps C#

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C#

Bitmap

image-processing

Hi. I would like to do some image processing in C# and need to align two images before applying a filter to them. I will attempt to do this by scanning the images at a fixed point in a small rectangular section, which I believe makes it necessary to use the Bitmap class. This section has a large amount of white pixels so I would like to take an average pixel value in this area to find the shift in the y-axis, as there is a large white horizontal bar going across the images. The x-axis will be the same in both images. I would like to setup a few test images with different shift values, from small to large, positive and negative, so I can search for the minimum value . This will require a scroll bar on the images to move them in small amounts. I am totally new to C#, and low level programmer. I have been trying to get the image in pictureBox1 with the following code.

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing.Imaging; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms;

namespace imageAlign

{ public partial class Form1 : Form

{
    public Form1()

    {
        InitializeComponent();
    }
    private void button1_Click(object sender, EventArgs e)
    {
        Bitmap myImage = (Bitmap)pictureBox1.Image;
        OpenFileDialog ofd = new OpenFileDialog();

        if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK) ;
        {
            pictureBox1.Image = Image.FromFile();


           // this.pictureBox1.Image = myImage;
        }
    }
}

}

I have left the Image.FromFile(); with nothing passed as I wish to choose the images when I click the button on the form. Currently, I only have one button and picture box.

Thanks