title: Concatenate Array of PDF Files Using File Paths not working
body: <p>I was following the Guide on "How to concatenate array of pdf using file path" on <a href="http://www.aspose.com/docs/display/pdfnet/Concatenate+Array+of+PDF+Files+Using+File+Paths+%28Facades%29" rel="nofollow">this page</a> But with no luck. 
  example: Using the code</p>
  
  <pre><code>using Aspose.Pdf.Facades;
      string[] filesArray = new string[2];
          filesArray[0] = @"D:\MergedPDF\Ball_007811263X\baL1263x_ch01_001-029.pdf";
          filesArray[1] = @"D:\MergedPDF\Ball_007811263X\baL1263x_ch02_030-061.pdf";
          // create PdfFileEditor object
          PdfFileEditor pdfEditor = new PdfFileEditor();
          // display the resultant concatenated PDF file in 
          pdfEditor.Concatenate(filesArray, "outputfoe.pdf");
  </code></pre>
  
  <p>but it give me an error on the pdfEditor part of <strong>pdfEditor</strong>.Concatenate(filesArray, "outputfoe.pdf");</p>
  
  <pre><code>The error says: 
  Error   1   The type 'System.Web.HttpResponse' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.  C:\Users\rsubedi\Documents\Visual Studio 2012\Projects\MergePDFManual\MergePDFManual\Program.cs 26  13  MergePDFManual
  </code></pre>