i want to read pdf filenames in c#

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C#

Actually i have develop one winform application.this application access content of files

but didn't access that filenames.i want to access pdf filenames in c# accroding to my

developed code.

my code like as:

public static string ExtractTextFromPdf(string filename)
       {
           using (PdfReader reader = new PdfReader(filename))
           {
               StringBuilder text = new StringBuilder();

               for (int i = 1; i <= reader.NumberOfPages; i++)
               {
                   text.Append(PdfTextExtractor.GetTextFromPage(reader,i));
                   //text.Append(PdfTextExtractor.GetTextFromPage(reader,i));
               }
               return text.ToString();
           }
       }
       private void button1_Click(object sender, EventArgs e)
       {
           string pathName = @"D:\Data Sets\Enron";

           string[] pdfFileNames = Directory.GetFiles(pathName, "*.pdf");

           foreach (string pdfFileName in pdfFileNames)
           {
               DocumentVector d1 = new DocumentVector();
               d1.content= ExtractTextFromPdf(pdfFileName);
               docCollection.DocumentList.Add(d1.content);

           }

           MessageBox.Show(pdfFileNames.Length.ToString());

       }

pls help me as soon as possible.thank u.