winforms - How to implement "Search Previous" in a "Find Keyword" Windows Form in C# -


i have log window in c# application. have implemented find keyword feature in form, searches matching text in richtextbox. want build feature search next , previous matches throughout richtextbox.

the code findnext 

try {     if (start_search_point < log_textbox.text.length && start_search_point != -1)     {         log_textbox.selectionbackcolor = highlight_all_color;         log_textbox.find(search_keyword, start_search_point, richtextboxfinds.wholeword);         log_textbox.selectionbackcolor = color.honeydew;          if (start_search_point + search_keyword.length < log_textbox.text.length)             start_search_point = log_textbox.text.indexof(search_keyword, start_search_point + search_keyword.length);         else             start_search_point = 0;     }     else     {         start_search_point = 0;     } } catch (exception ex) {     mdiparent.thismdiobj.txtlog.invoke(new action(() => mdiparent.thismdiobj.txtlog.appendtext(datetime.now.tostring() + " : " + ex.message + "=>" + ex.stacktrace.tostring() + environment.newline))); }

can me findprevious part? cannot figure out logic one.

how creating matchcollection , work it? 

matchcollection matches = new regex().matches(search_keyword);  int currentindex = 0;

and use currentindex elements collection- 

if(currentindex > 0) --currentindex;   // previous search result matches[currentindex];

example: enter image description here


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