//Main controller ViewerController.ashx
/// <summary>
/// Get document page
/// </summary>
/// <param name="postedData">Post data</param>
/// <returns>Document page object</returns>
[Action("loadDocumentPages")]
public List<PageDescriptionEntity> LoadDocumentPages(PostedDataEntity postedData)
{
    // get/set parameters
        string documentGuid = postedData.guid;

        if (!Path.IsPathRooted(documentGuid))
        {
            documentGuid = sTmpDir + "/" + documentGuid;
        }

        var password = (string.IsNullOrWhiteSpace(postedData.password)) ? null : postedData.password;
        // get document info options
        var documentInfoOptions = new DocumentInfoOptions();
        // set password for protected document
        documentInfoOptions.Password = password;
        // get document info container
        var documentInfoContainer = this.GetHandler().GetDocumentInfo(documentGuid, documentInfoOptions);
        return postedData.pages.Select(pageNumber =>
        {
            PageDescriptionEntity page = GetPageDescriptionEntities(documentInfoContainer.Pages[pageNumber - 1]);
            page.SetData(GetPageContent(documentInfoContainer.Pages[pageNumber - 1], password, documentGuid));
            // return loaded page object
            return page;
        }).ToList();
}

private PageDescriptionEntity GetPageDescriptionEntities(PageData page)
{
        PageDescriptionEntity pageDescriptionEntity = new PageDescriptionEntity();
        pageDescriptionEntity.number = page.Number;
        pageDescriptionEntity.angle = page.Angle;
        pageDescriptionEntity.height = page.Height;
        pageDescriptionEntity.width = page.Width;
        return pageDescriptionEntity;
}

private string GetPageContent(PageData page, string password, string documentGuid)
{
        if (htmlMode)
        {
        HtmlOptions htmlOptions = new HtmlOptions();
        SetOptions(htmlOptions, password, page.Number);
        // get page HTML
        return this.GetHandler().GetPages(documentGuid, htmlOptions)[0].HtmlContent;

        }
        else
        {
        ImageOptions imageOptions = new ImageOptions();
        SetOptions(imageOptions, password, page.Number);
        byte[] bytes;
        using (var memoryStream = new MemoryStream())
        {
            this.GetHandler().GetPages(documentGuid, imageOptions)[0].Stream.CopyTo(memoryStream);
            bytes = memoryStream.ToArray();
        }
        string encodedImage = Convert.ToBase64String(bytes);
        return encodedImage;
        }
}
private void SetOptions(HtmlOptions options, string password, int pageNumber)
{
    options.EmbedResources = true;
    // set password for protected document
    if (!string.IsNullOrEmpty(password))
    {
        options.Password = password;
    }
    if (pageNumber != 0)
    {
        options.PageNumber = pageNumber;
        options.CountPagesToRender = 1;
    }
    options.CellsOptions.ShowGridLines = true;
}