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Code Samples - Neevia PDFmerge/split

Example 2: Merge several PDF files and encrypt the output - C# Copy 

Add a reference in your Visual Studio project to PDFmergeNET assembly.
To do this:
        a. On the Project menu, click Add Reference;
        b. On the .NET tab, locate PDFmergeNET and then click Select;
        c. Click OK in the Add References dialog box to accept your selections. 
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   PDFMerge.Neevia NVmerge = new PDFMerge.Neevia();
   int retVal;

   NVmerge.PDFEncrypt = true;
   NVmerge.PDFEncryptionType = "rc4";
   NVmerge.PDFOwnerPassword = "owner";

   // p - document printing is denied
   // e - disable extraction of text and graphics
   NVmerge.PDFPermissions = "pe";

   retVal = NVmerge.MergePDF(@"c:\1.pdf+c:\2.pdf",@"c:\merged.pdf");
   if (retVal != 0) {
     MessageBox.Show("Error code = " + retVal.ToString());
   } else {
     MessageBox.Show("Done");
   }