itext - saving modified data in pdf itextsharp -


i have created pdf using itextsharp contains editable fields, when service called pdf created. problem facing is, if changing in pdf , downloading changes not saved. want open pdf in new tab through server side.

code using is:

public static string[] languages_gc = { "english", "math", "science" };     [httpget]     [odataroute("getpdf")]     public void downloadpdf()     {         httpcontext.current.response.contenttype = "application/pdf";         httpcontext.current.response.addheader("content-disposition", "inline;filename=example.pdf");         httpcontext.current.response.cache.setcacheability(httpcacheability.nocache);          document doc = new document(itextsharp.text.pagesize.a4, 10f, 10f, 100f, 0f);         string pdffilepath = httpcontext.current.server.mappath(".") + "/pdffiles";         pdfwriter wri = pdfwriter.getinstance(doc, httpcontext.current.response.outputstream);         doc.open();         doc.addauthor("test author");         doc.addcreationdate();         pdfcontentbyte cb = wri.directcontent;         font _bf = new font(font.fontfamily.helvetica, 6);         pdfformfield _radiogroup = pdfformfield.createradiobutton(wri, true);         _radiogroup.fieldname = "language_gc";         rectangle _rect;         radiocheckfield _radiog;         pdfformfield _radiofield1;         pdfformfield field;         (int = 0; < languages_gc.length; i++)         {             _rect = new rectangle(46, 806 - * 40, 60, 788 - * 40);             _radiog = new radiocheckfield(wri, _rect, null, languages_gc[i]);             _radiog.backgroundcolor = new graycolor(0.8f);             _radiog.bordercolor = graycolor.black;             _radiog.checktype = radiocheckfield.type_circle;             _radiofield1 = _radiog.radiofield;             _radiogroup.addkid(_radiofield1);                            columntext.showtextaligned(cb, element.align_left, new phrase(languages_gc[i], new font(font.fontfamily.helvetica, 18)), 70, 790 - * 40, 0);         }         /* button */         _rect = new rectangle(300, 806, 370, 788);       pushbuttonfield button = new pushbuttonfield(wri, _rect, "buttons");       button.backgroundcolor = new graycolor(0.75f);       button.bordercolor = graycolor.grayblack;       button.borderwidth = 1;       button.borderstyle = pdfborderdictionary.style_beveled;       button.textcolor = graycolor.grayblack ;       button.fontsize = 12;       button.text = "submit";       //button.layout = pushbuttonfield.layout_icon_left_label_right;       button.scaleicon = pushbuttonfield.scale_icon_always;       button.proportionalicon = true;       button.iconhorizontaladjustment = 0;        field = button.field;       field.action = pdfaction.javascript("this.showbuttonstate()", wri);       wri.addannotation(field);      //}     //return ms.toarray();         /*----------------------------------------------------*/         wri.addannotation(_radiogroup);         wri.addannotation(button.field);         cb = wri.directcontent;         doc.close();         httpcontext.current.response.write(doc);         httpcontext.current.response.end();     }

can suggest me solution??

let's make analogy here, simpler file-type. suppose you're showing user textfile. open in native .txt app (notepad) , make changes.

do expect changes communicated automatically server? or changes magically propagated? of course not. , if would, seems functionality notepad have provide, rather creator of file should do.

now, happens, there particular standard of pdf documents exists precisely use-case. essentially, document sets connection server, , synchronizes. however, standard rather obscure, not lot of viewers support it.

to best of knowledge, no pdf library (including itext) supports making documents that.


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