/// <summary>
/// Applies the first page of the PDF file located at waterMarkImagePdfPath as a watermark
/// to each page of the PDF file located at inputFilePath
/// </summary>
/// <param name="inputFilePath">File path of document to be watermarked</param>
/// <param name="waterMarkImagePdfPath">File path of watermark template</param>
public void AddWatermark(string inputFilePath, string waterMarkImagePdfPath)
{
var temp = inputFilePath + ".watermark";
var watermarkImage = this.ConvertSinglePdfPageToJpegImage(waterMarkImagePdfPath, 1);
using (var doc = new Doc())
{
doc.Read(inputFilePath);
int theCount = doc.PageCount;
int theID = 0;
for (int i = 1; i <= theCount; i++)
{
doc.PageNumber = i;
doc.Layer = doc.LayerCount + 1;
if (i == 1)
{
theID = doc.AddImageFile(watermarkImage.FullName, 1);
}
else
{
doc.AddImageCopy(theID);
}
}
doc.Save(temp);
doc.Clear();
doc.Dispose();
}
File.Delete(inputFilePath);
File.Move(temp, inputFilePath);
File.Delete(watermarkImage.FullName);
}