c# - Setting a string from one destination to another -

i want include string "oldsummary" in second richtextbox, of summary's functionality belongs streamread after opening file. there way when btn1 button clicked, display oldsummary string? @ moment it's blank due it's global string set "" want display oldsummary string set in mnuopen button.

string oldsummary = ""; private void mnuopen_click(object sender, eventargs e) {      //load file code remove example goes here…      //add data text file rich text box     richtextbox1.loadfile(chosen_file, richtextboxstreamtype.plaintext);      //read lines of text in text file                     string textline = "";     int linecount = 0;      system.io.streamreader txtreader;     txtreader = new system.io.streamreader(chosen_file);          {         textline = textline + txtreader.readline() + " ";         linecount++;     }     //read line until there no more characters     while (txtreader.peek() != -1);      //seperate characters in order find words     char[] seperator = (" " + nl).tochararray();      //number of words, characters , include line breaks variable     int numberofwords = textline.split(seperator, stringsplitoptions.removeemptyentries).length;      int numberofchar = textline.length - linecount;      string divider = "------------------------";      //unprocessed summary     string oldsummary = "word count: " + numberofwords + "characters count: " + numberofchar + divider;      txtreader.close(); }  private void btn1_click(object sender, eventargs e) {     string wholetext = "";     string copytext = richtextbox1.text;     wholetext = oldsummary + copytext;     richtextbox2.text = wholetext; } 

try replacing:

string oldsummary = "word count: " + numberofwords + "characters count: " + numberofchar + divider; 

with:

oldsummary = "word count: " + numberofwords + "characters count: " + numberofchar + divider; 

so assign value class field used in btn1_click.