private void ShowPDF(string fileName) { PDFLibrary qp = new PDFLibrary(); qp.UnlockKey(LicenseKey); qp.LoadFromFile(fileName); // Fit width of PDF to width of picture box int dpi = Convert.ToInt32((pictureBox1.Width * 72) / qp.PageWidth()); byte[] bmpData = (byte[])qp.RenderPageToVariant(dpi, 1, 0); MemoryStream ms = new MemoryStream(bmpData); Bitmap bmp = new Bitmap(ms); pictureBox1.Image = bmp; ms.Dispose(); }