how to read pdf file in asp.net using c#.net

Question

hi friends....

   i want to read .pdf file using c#.net code and have to save that file ... Below is my code ... But it reads only one page of a file. I want to read all the   
     pages of a file.

              Anyone help me...



            else if (extn.Equals(".pdf"))
            {
                string filePath = Server.MapPath("uploads/" + filename);
                string pdfText = string.Empty;

                PdfReader pdfreader = new PdfReader(filePath);

                //for (int page = 1; page <= pdfreader.NumberOfPages; page++)
                //{

                   ITextExtractionStrategy itextextStrat = new iTextSharp.text.pdf.parser.SimpleTextExtractionStrategy();

                   // ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();

                   String extractText = PdfTextExtractor.GetTextFromPage(pdfreader,i, itextextStrat);

                    extractText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(extractText)));

                    pdfText = pdfText + extractText;


                   // byte[] bytes = Encoding.UTF8.GetBytes("?"); //bytes now holds 0xDB8C
                   // byte[] converted = Encoding.Convert(Encoding.Default, Encoding.UTF8, bytes);//converted now holds 0xC39BC592
                   //// string final = Encoding.UTF8.GetString(converted);
                   // string pdftext = Encoding.UTF8.GetString(converted);

                    pdfreader.Close();
            
                    query = "INSERT INTO Fileupload([category],[subcategory],[uid],[oid],[up_name],[demo1],[keyword],[fdata],[aflag],sizebyte) VALUES('" + dropcategory.SelectedValue + "','" + DropDownList1.SelectedValue + "','" + Session["user_id"].ToString() + "','" + txtOwnerId.SelectedItem + "','" + fname + "','" + demo1.Text + "','" + key + "','" +pdfText+ "',1,'" + size + "')  ";
            
                //}
           SqlCommand cmd = new SqlCommand(query, con);

            cmd.ExecuteNonQuery();// ExecuteScalar().ToString();
           
   
   }


                   Thanks in Advance....