if (dgvAndon.Rows[e.RowIndex].Cells["urgencyOrder"].ToString() == "1")
{
   //Here I want to add the image in the image property field DataGridViewImageColumn.
}

for (int row = 0; row <= [YourDataGridViewName].Rows.Count - 1; row++)
{
    ((DataGridViewImageCell)gvFiles.Rows[row].Cells[1]).Value = Properties.Resources.Picture1
}

DataGridViewImageColumn iconColumn = new DataGridViewImageColumn();
        iconColumn.Name = "AirplaneImage";
        iconColumn.HeaderText = "Airplane Image";
        dataGridView1.Columns.Insert(5, iconColumn);

        for (int row = 0; row < dataGridView1.Rows.Count - 1; row++)
        {
            Bitmap bmp = new Bitmap(Application.StartupPath + "\Data\AirPlaneData\" + dt.Rows[row][4]);
            ((DataGridViewImageCell)dataGridView1.Rows[row].Cells[5]).Value = bmp;
        }

protected void gridView1_RowDataBound(Object sender, GridViewRowEventArgs args)
    {
     if(args.Row.RowType == DataControlRowType.DataRow)
     {
      Image img = (Image) e.Row.FindControl("Image1");
      img.ImageUrl = setImageURLHere;
     }
    }

OpenFileDialog openFileDialog = new OpenFileDialog();
        openFileDialog.RestoreDirectory = true;

        openFileDialog.Filter = "All picture files (*.BMP;*.JPG;*.GIF)|*.BMP;*.JPG;*.GIF";

        if (openFileDialog.ShowDialog() == DialogResult.OK)
        {
            FileName = openFileDialog.FileName;
            //pictureBox2.Image = Image.FromFile(FileName);
        }