Pass string[] to merge images to pdf ASP.NET

I'm trying to merg images from a folder to a pdf file. here is my code:

///
/// Takes a collection of BMP files and converts them into a PDF document
///
///
///
private byte[] CreatePdf(string[] bmpFilePaths)
{
using (var ms = new MemoryStream())
{
var document = new iTextSharp.text.Document(iTextSharp.text.PageSize.LETTER.Rotate(), 0, 0, 0, 0);
iTextSharp.text.pdf.PdfWriter.GetInstance(document, ms).SetFullCompression();
document.Open();
foreach (var path in bmpFilePaths)
{
var imgStream = GetImageStream(path);
var image = iTextSharp.text.Image.GetInstance(imgStream);
image.ScaleToFit(document.PageSize.Width, document.PageSize.Height);
document.Add(image);
}
document.Close();
return ms.ToArray();
}
}
///
/// Gets the image at the specified path, shrinks it, converts to JPG, and returns as a stream
///
///
///
private Stream GetImageStream(string imagePath)
{
var ms = new MemoryStream();
using (var img = Image.FromFile(imagePath))
{
var jpegCodec = ImageCodecInfo.GetImageEncoders()
.Where(x => x.MimeType == "image/jpeg")
.FirstOrDefault();
var encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, (long)20);
int dpi = 175;
var thumb = img.GetThumbnailImage((int)(11 * dpi), (int)(8.5 * dpi), null, IntPtr.Zero);
thumb.Save(ms, jpegCodec, encoderParams);
}
ms.Seek(0, SeekOrigin.Begin);
return ms;
}

The images are in a folder. can somebody please tell me how to pass string[] with the list of images links to CreatePdf(string[] bmpFilesPath) from a button click function.