[Solved] Duplicate Image inserted in PDF file using iText 7 in ASP.Net

This is my code for convert to html data stored in a database table using iText 7 and .

the problem is that when I add an image in correspondence of the database row, this image is duplicated or tripled in the pdf file.

Instead in the database table the image is present only once.

    if (dt.Rows.Count > 0)
    {
        for (int i = 0; i < dt.Rows.Count; i++)
        {
            contents = new Paragraph(dt.Rows[i]["contents"].ToString())
                .SetTextAlignment(TextAlignment.JUSTIFIED)
                .SetFontSize(12);

            List<IElement> lst = HtmlConverter.ConvertToElements(dt.Rows[i]["contents"].ToString()).ToList();

            for (int j = 0; j < lst.Count; j++)
            {
                IBlockElement element = (IBlockElement)lst[j];

                if (!String.IsNullOrEmpty(dt.Rows[i]["sID_content_image"].ToString()))
                {
                    Image image_path = new Image(ImageDataFactory
                          .Create(dt.Rows[i]["sID_content_image"].ToString()))
                          .SetHorizontalAlignment(HorizontalAlignment.CENTER)
                          .SetTextAlignment(TextAlignment.CENTER);

                    image_path.ScaleToFit(500, 500);
                    image_path.SetAutoScale(true);

                    document.Add(image_path);
                }
            }
        }

        dest = filename.ToString();
    }