c# - Windows Forms text editor search function -

i have 2 forms, 1 text editor, , second search form.

in form1 have defined getrichtextbox() function. works there, how retrieve form2 (and other stuff)?

my form1:

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace texteditor {     public partial class form1 : form     {         public form1()         {             initializecomponent();         }          private richtextbox getrichtextbox()         {             richtextbox rtb = null;             tabpage tp = tabcontrol1.selectedtab;              if (tp != null)             {                 rtb = tp.controls[0] richtextbox;             }              return rtb;         }          private void newtoolstripmenuitem_click(object sender, eventargs e)         {             tabpage tp = new tabpage("doc");             richtextbox rtb = new richtextbox();             rtb.dock = dockstyle.fill;              tp.controls.add(rtb);             tabcontrol1.tabpages.add(tp);         }          private void cuttoolstripmenuitem_click(object sender, eventargs e)         {             getrichtextbox().cut();         }          private void copytoolstripmenuitem_click(object sender, eventargs e)         {             getrichtextbox().copy();         }          private void pastetoolstripmenuitem_click(object sender, eventargs e)         {             getrichtextbox().paste();         }          private void undotoolstripmenuitem_click(object sender, eventargs e)         {             getrichtextbox().undo();         }          private void redotoolstripmenuitem_click(object sender, eventargs e)         {             getrichtextbox().redo();         }          private void opentoolstripmenuitem_click(object sender, eventargs e)         {             openfiledialog openfd = new openfiledialog();             string chosen_file = "";              openfd.initialdirectory = "c:";             openfd.title = "open text file";             openfd.filename = "";              openfd.filter = "text files|*.txt|word documents|*.doc";              if (openfd.showdialog() != dialogresult.cancel)             {                  chosen_file = openfd.filename;                 tabpage tab = new tabpage() { text = system.io.path.getfilename(chosen_file) };                 tabcontrol1.tabpages.add(tab);                 tabcontrol1.selectedtab = tab;                 richtextbox box = new richtextbox { parent = tab, dock = dockstyle.fill };                 box.loadfile(chosen_file, richtextboxstreamtype.plaintext);              }         }          private void savetoolstripmenuitem_click(object sender, eventargs e)         {             savefiledialog savefd = new savefiledialog();              string saved_file = "";              savefd.initialdirectory = "c:";             savefd.title = "save text file";             savefd.filename = "";              savefd.filter = "text files|*.txt|word documents|*.doc";              if (savefd.showdialog() != dialogresult.cancel)             {                  saved_file = savefd.filename;                 getrichtextbox().savefile(saved_file, richtextboxstreamtype.plaintext);                 messagebox.show("your file has been saved!", "success", messageboxbuttons.ok, messageboxicon.information);              }          }          private void exittoolstripmenuitem_click(object sender, eventargs e)         {             if (messagebox.show("are sure?", "exit", messageboxbuttons.okcancel) == dialogresult.ok)             {                  application.exit();              }         }          private void closetabtoolstripmenuitem_click(object sender, eventargs e)         {             tabpage active_tab = tabcontrol1.selectedtab;             tabcontrol1.tabpages.remove(active_tab);         }          private void searchtoolstripmenuitem_click(object sender, eventargs e)         {             var search = new form2();             search.showdialog();         }     } } 

and ofcourse, form2:

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.threading.tasks; using system.windows.forms;  namespace texteditor {     public partial class form2 : form     {         public form2()         {             initializecomponent();         }          private void button1_click(object sender, eventargs e)         {             int index = 0; string temp = richtextbox1.text; richtextbox1.text = ""; richtextbox1.text = temp;              while (index < richtextbox1.text.lastindexof(textbox1.text))             {                  richtextbox1.find(textbox1.text, index, richtextbox1.textlength, richtextboxfinds.none);                  richtextbox1.selectionbackcolor = color.orange;                  index = richtextbox1.text.indexof(textbox1.text, index) + 1;             }         }     } }