c#

OpenFileDialog dlg = new OpenFileDialog();
            dlg.Filter = "PDF Files(.PDF) |* .PDF|All Files(.)|*.*";

            string strText = string.Empty;
            PdfReader reader = new PdfReader(@"C:\Users\pavle\Desktop\007_vezbe_cacak.pdf");

            for (int page = 1; page < reader.NumberOfPages; page++)
            {
                ITextExtractionStrategy its = new LocationTextExtractionStrategy();
                String s = PdfTextExtractor.GetTextFromPage(reader, page, its);
                strText += s;
            }

            richTextBox1.Text = strText;

            reader.Close();