activePDF Toolkit不僅具有編輯功能，還能對文件實現合并，本次教程將給出文件合并的代碼示例:

》》》下載activePDF Toolkit試用版

代碼示例如下：

// Copyright (c) 2013 activePDF, Inc.
// Example created 01/17/13

// Make sure to add the activePDF product .NET DLL(s) to your application.
// .NET DLL(s) are typically found in the products 'bin' folder.

class Examples
{
  public void main()
  {
    string strPath;
    int intOpenOutputFile;
    int intMergeFile;
    
    strPath = AppDomain.CurrentDomain.BaseDirectory;

    // Instantiate Object
    APToolkitNET.Toolkit oTK = new APToolkitNET.Toolkit();
    
    // Create the new PDF file
    intOpenOutputFile = oTK.OpenOutputFile(strPath + "new.pdf");
    if (intOpenOutputFile != 0)
    {
      ErrorHandler("OpenOutputFile", intOpenOutputFile);
    }
    
    // Set whether the fields should be read only in the output PDF
    // 0 mark all fields read-only, 1 leave fields as they are
    // Fields set with SetFormFieldData will not be effected
    oTK.ReadOnlyOnMerge = 1;
    
    // MergeFile is the equivalent of OpenInputFile and CopyForm
    
    // Merge the cover page (0 for all pages)
    intMergeFile = oTK.MergeFile(strPath + "cover.pdf", 0, 0);
    if (intMergeFile != 1)
    {
      ErrorHandler("MergeFile", intMergeFile);
    }
    
    // Merge the second PDF
    intMergeFile = oTK.MergeFile(strPath + "5pageLI.pdf", 0, 0);
    if (intMergeFile != 1)
    {
      ErrorHandler("MergeFile", intMergeFile);
    }
    
    // Merge the third PDF
    intMergeFile = oTK.MergeFile(strPath + "6pageAA.pdf", 0, 0);
    if (intMergeFile != 1)
    {
      ErrorHandler("MergeFile", intMergeFile);
    }
    
    // Close the new file to complete PDF creation
    oTK.CloseOutputFile();
    
    // Release Object
    oTK = null;
    
    // Process Complete
    System.Diagnostics.Debug.WriteLine("Done!");
  }
  
  // Error Handling
  public static void ErrorHandler(string strMethod, object rtnCode)
  {
    System.Diagnostics.Debug.WriteLine(strMethod + " error:  " + rtnCode.ToString());
  }
}