Select image from db to pdf document C#

Question

I try this Itext sharp and work

 

iTextSharp.text.Image logo = iTextSharp.text.Image.GetInstance("C:\\Program files\\BSS\\memorandum.jpg");

logo.ScaleAbsolute(550, 110);
logo.SetAbsolutePosition(25, 715);
pdfDoc.Add(logo);

 I need from db to document

And When try solution down

 

string Memorandum = "";
           using (SqlConnection openCon14 = new SqlConnection(Con))
           {
               SqlDataReader reader14;
               SqlCommand cmd14 = new SqlCommand();
               cmd14.CommandText = "select memorandum from podaci_o_korisniku";
               cmd14.Connection = openCon14;
               openCon14.Open();
               reader14 = cmd14.ExecuteReader();
               while (reader14.Read())
               {
                  Memorandum = reader14[0].ToString();
               }
               openCon14.Close();
           }

 And have error

 

+       $exception  {"Could not find file 'C:\\Users\\Bibic Goran\\source\\repos\\BSS\\BSS\\bin\\Debug\\System.Byte[]'."}   System.Net.WebException

 System byte missing?