c# - Replacing a certain word in a text file -

i know has been asked few times, have seen lot of regex etc., , i'm sure there way stream reader/writer. below code. i'm trying replace "tea" word "cabbage". can help? believe have wrong syntax.

namespace week_9_exer_4 {     class textimportedit     {         public void editorialcontrol()         {             string filename;             string linereadfromfile;               console.writeline("");             // ask name of file read             console.write("which file wish read? ");             filename = console.readline();             console.writeline("");              // open file reading             streamreader filereader = new streamreader("c:\\users\\greg\\desktop\\programming files\\story.txt");              // read lines file , display them             // until null returned (indicating end of file)             linereadfromfile = filereader.readline();              console.writeline("please enter word wish edit out: ");             string editword = console.readline();                          while (linereadfromfile != null)             {                 console.writeline(linereadfromfile);                 linereadfromfile = filereader.readline();             }              string text = file.readalltext("c:\\users\\greg\\desktop\\programming files\\story.txt");             filereader.close();              streamwriter filewriter = new streamwriter("c:\\users\\greg\\desktop\\programming files\\story.txt", false);             string newtext = text.replace("tea", "cabbage");             filewriter.writeline(newtext);             filewriter.close();          }     } } 

if don't care memory usage:

string filename = @"c:\users\greg\desktop\programming files\story.txt"; file.writealltext(filename, file.readalltext(filename).replace("tea", "cabbage")); 

if have multi-line file doesn't randomly split words @ end of line, modify 1 line @ time in more memory-friendly way:

// open stream source file using (var sourcefile = file.opentext(filename)) {     // create temporary file path can write modify lines     string tempfile = path.combine(path.getdirectoryname(filename), "story-temp.txt");     // open stream temporary file     using (var tempfilestream = new streamwriter(tempfile))      {         string line;         // read lines while file has them         while ((line = sourcefile.readline()) != null)          {             // word replacement             line = line.replace("tea", "cabbage");             // write modified line new file             tempfilestream.writeline(line);         }     } } // replace original file temporary 1 file.replace("story-temp.txt", "story.txt", null);