c# - Text shown in single line in notepad -

i having issue regular notepad.

if open file in wordpad, displays text rich textbox correctly (with line breaks textbox). in notepad it's 1 huge line, how can when writing file, recognizes linebreaks in rich text box?

what open notepad file contains block of text , goes richtextbox1.

copy text first text box , write in richtextbox2 text first richtextbox , copied text stripped vowels (copytext) write second notepad file (_parsed.text).

string chosen_file = "c:\\_testfile.txt"; string second_file = "c:\\_parsed.txt"; string wholetext = "";  private void mnuopen_click(object sender, eventargs e) {          //add data text file rich text box         richtextbox1.loadfile(chosen_file, richtextboxstreamtype.plaintext);          //read lines of text in text file                         string textline = "";          streamreader txtreader;         txtreader = new streamreader(chosen_file);          {             textline = textline + txtreader.readline() + " ";         }          //read line until there no more characters         while (txtreader.peek() != -1);          richtextbox1.text = textline;          txtreader.close();     }  }  private void write(string file, string text) {      //check see if _parsed file exists          //write _parsed text file         using(streamwriter objwriter = new streamwriter(file)) {             objwriter.write(text);             objwriter.close();     }   }  private void newsummarymethod(string copytext) {      //write richtextbox2 relevant text     copytext = richtextbox1.text;     wholetext = richtextbox1.text + copytext     write(second_file, wholetext); }   private void btn1_click(object sender, eventargs e) {          newsummarymethod(copytext); } 

first of try separate data , presentation.

if have file lines in can read file.readlines method

var lines = file.readlines("file1.txt"); 

after can show lines on textbox, console whatever else.

when you're appending text, update lines collection

lines.addrange(secondlistoflines); 

and save updated file using file.writealllines method:

file.writealllines(lines, "file2.txt");