Outputted pdf not filling with the content in iTextsharp and C#.net, creating with Zero bytes -

i working replace specific word inside pdf document using itextsharp , c#.net, while debugging getting proper value outputted pdf getting 0 bytes(empty),its not filling content.

replacepdftext("mumbai",stringcomparison.currentcultureignorecase,application.startuppath + "\\test.pdf","d:\\test_words_replaced.pdf"); //do  public void replacepdftext(string strsearch, stringcomparison sccase, string strsource, string strdest)     {          pdfstamper psstamp = null; //pdf stamper object         pdfcontentbyte pcbcontent = null; //read pdf content          if (file.exists(strsource)) //check if file exists         {              pdfreader pdffilereader = new pdfreader(strsource); //read our file              psstamp = new pdfstamper(pdffilereader, new filestream(strdest, filemode.create)); //read underlying content of pdf file              pbprogress.value = 0; //set progressbar minimum value             pbprogress.maximum = pdffilereader.numberofpages; //set progressbar maximum value              (int intcurrpage = 1; intcurrpage <= pdffilereader.numberofpages; intcurrpage++) //loop through pages             {                  loctextextractionstrategy ltestrategy = new loctextextractionstrategy(); //read pdf file content blocks                  pcbcontent = psstamp.getundercontent(intcurrpage); //look @ current block                  //determine spacing of block see if matches our search string                 ltestrategy.undercontentcharacterspacing = pcbcontent.characterspacing;                 ltestrategy.undercontenthorizontalscaling = pcbcontent.horizontalscaling;                  //trigger block reading process                 string currenttext = pdftextextractor.gettextfrompage(pdffilereader, intcurrpage, ltestrategy);                  //determine match(es)                 list<itextsharp.text.rectangle> lstmatches = ltestrategy.gettextlocations(strsearch, sccase);                  pdflayer pdlayer = default(pdflayer); //create new layer                 pdlayer = new pdflayer("overrite", psstamp.writer); //enable overwriting capabilities                  //set fill colour of replacing layer                 pcbcontent.setcolorfill(basecolor.black);                  foreach (itextsharp.text.rectangle rctrect in lstmatches) //loop through each match                 {                      pcbcontent.rectangle(rctrect.left, rctrect.bottom, rctrect.width, rctrect.height); //create new rectangle replacing layer                      pcbcontent.fill(); //fill colour specified                      pcbcontent.beginlayer(pdlayer); //create layer                      pcbcontent.setcolorfill(basecolor.black); //fill alyer                      pcbcontent.fill(); //fill underlying content                      pdfgstate pgstate = default(pdfgstate); //create gstate object                     pgstate = new pdfgstate();                      pcbcontent.setgstate(pgstate); //set current state                      pcbcontent.setcolorfill(basecolor.white); //fill letters                      pcbcontent.begintext(); //start text replace procedure                      pcbcontent.settextmatrix(rctrect.left, rctrect.bottom); //get text location                      //set new font , size                     pcbcontent.setfontandsize(basefont.createfont(basefont.helvetica, basefont.cp1252, basefont.not_embedded), 9);                      pcbcontent.showtext("amazing!!!!"); //replacing text                      pcbcontent.endtext(); //stop text replace procedure                      pcbcontent.endlayer(); //stop layer replace rocedure                  }                                    pbprogress.value++; //increase progressbar value                  pdffilereader.close(); //close file                              }              //psstamp.close(); //close stamp object                      }          } 

you call

pdffilereader.close(); 

much early: inside loop in next iteration still requires pdffilereader , furthermore before closing stamper.

the stamper requires pdfreader still open when stamper closes because copies parts of reader then.