Create a gui from take a picturebox and a button
tyep this code in the button_click event...___:
OpenFileDialog od = new OpenFileDialog();
            DialogResult dr = od.ShowDialog();
            if (dr == DialogResult.OK)
            {
                filename = od.FileName.ToString();
                Bitmap bmp = new Bitmap(filename);
                pictureBox1.Image = bmp;
            }
            else
            {
                MessageBox.Show("not selected");
            }
        }