c# - Add a new line at a specific position in a text file. -

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i trying add specific line of text in file. between 2 boundaries.

an example of if wanted add line in between boundaries of item1:

[item1] 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 7 //add line here in between specific boundaries [/item1] [item2] 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 8 2550 coins 995 200000 7 2550 coins 995 200000 7 [/item2] [item3] 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 7 2550 coins 995 200000 7 [/item3]

this have tried far, near correct. keeps saying file being used reader cant edited writer, when did work cleared entire document.

public void createentry(string npcname) {     string line;     string filename = "drops.de";     streamwriter streamwriter = new streamwriter(filename);     streamreader streamreader = new streamreader(filename);     line = streamreader.readline();     if (line == ("[" + npcname + "]"))     {         streamreader.readline();         streamwriter.writeline("test");     } }

i know how write lines @ end of document.

this add line want it. (make sure have using system.io; added)

public void createentry(string npcname) {     //npcname = @"[/item1]"; <-- note '/'.     string linetoadd = "//add line here in between specific boundaries";     string filename = "test.txt";     list<string> txtlines = new list<string>();      //fill list<string> lines txt file.     foreach (string str in file.readalllines(filename))     {         txtlines.add(str);     }      //insert line want add last under tag 'item1'.     txtlines.insert(txtlines.indexof(npcname), linetoadd);      //clear file. using block close connection immediately.     using (file.create(filename)) { }      //add lines including new one.     foreach (string str in txtlines)     {         file.appendalltext(filename, str + environment.newline);     } }

two year update: highest voted answer wrote 2 years ago , use improvements. i'm doing strange things in above method , want provide better alternative future readers.

public void createentry(string npcname) //npcname = "item1" {     var filename = "test.txt";     var endtag = string.format("[/{0}]", npcname);     var linetoadd = "//add line here in between specific boundaries";      var txtlines = file.readalllines(filename).tolist();   //fill list lines txt file.     txtlines.insert(txtlines.indexof(endtag), linetoadd);  //insert line want add last under tag 'item1'.     file.writealllines(filename, txtlines);                //add lines including new one. }

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