c# - Find certain text in PDF, then return page number found on to another section NOTE: Uses Docotic.pdf -

in following code, user input search string (barcodedata). string truncated first 5 characters, , used jobnumber. jobnumber, name of pdf scanning barcodedata.

what like, 'find it' button execute below code, return value found startpagedata.

i can't tell if program isn't scanning pdf search string, or if value isn't returning program.

using bitmiracle.docotic.pdf; using system; using system.collections.generic; using system.componentmodel; using system.data; using system.diagnostics; using system.io; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.web; using system.windows.forms; using acrobat;  namespace barcodereader {     public partial class form1 : form     {         public string stringstofind;         public string pathtofile;          public form1()         {             initializecomponent();         }          private void barcodedata_textchanged(object sender, eventargs e)         {             stringstofind=barcodedata.text;             pathtofile = "c:\\" + stringtool.truncate(barcodedata.text, 5) + ".pdf";             jobnumberdata.text = stringtool.truncate(barcodedata.text, 5);         }          private void label4_click(object sender, eventargs e)         {          }          private void jobnumberdata_textchanged(object sender, eventargs e)         {             jobnumberdata.text = jobnumberdata.text.trimstart('0');             console.writeline(jobnumberdata.text);         }          private void startpagedata_textchanged(object sender, eventargs e)         {             console.writeline(startpagedata.text);         }          private void piecesdata_textchanged(object sender, eventargs e)         {         }          private void findit_click(object sender, eventargs e)         {             pdfdocument pdf = new pdfdocument(pathtofile);             (int = 0; < pdf.pages.count; i++)             {                 string pagetext = pdf.pages[i].gettext();                 int count = 0;                 int laststartindex = pagetext.indexof(stringstofind, 0, stringcomparison.currentcultureignorecase);                 while (laststartindex != -1)                 {                     count++;                     laststartindex = pagetext.indexof(stringstofind, laststartindex + 1, stringcomparison.currentcultureignorecase);                 }                  if (count != 0)                     startpagedata.text = convert.tostring(laststartindex);             }          }     }      public static class stringtool     {         /// <summary>         /// substring of first n characters.         /// </summary>         public static string truncate(string source, int length)         {             if (source.length > length)             {                 source = source.substring(0, length);             }             return source;         }          /// <summary>         /// substring of first n characters. [slow]         /// </summary>         public static string truncate2(string source, int length)         {             return source.substring(0, math.min(length, source.length));         }     } } 

what problem code? if findit_click not executed on click don't associate "find it" button.

the code in findit_click looks quite correct except several things:

• it may not expect. returns the last index in text of last page search string found. may expect the index of last page search string found?
• you may use pagetext.lastindexof method find laststartindex.
• don't forget dispose pdfdocument instance. e.g. use using keyword:

     using (pdfdocument pdf = new pdfdocument(pathtofile))     {     ...     }