System.NullReferenceException, Object reference not set to an instance of an object.
input.pdf (34.3 KB)
using GroupDocs.Watermark.Common;
using GroupDocs.Watermark.Watermarks;
using GroupDocs.Watermark;
namespace Gro…...Specify the desired text and font for the watermark TextWatermark...new Font("Arial", 60, FontStyle.Bold)); // Specify font color...