c# - Async webBrowser for filling out Form -

i need let webbrowser navigate several different similiar url's of 1 website, fill out form, click on send button, , read next site find out if previous step successfull or not. on success loop have stop.

fist stuck @ getting webbrowser.navigate("url"); work in loop. since page need time load have asynchronous.

i new whole asyncronous stuff, need help.

i have found solution on https://stackoverflow.com/a/15936400/4972402 took , put code filling out form , clicking submit button.

public partial class form1 : form {     public struct webbrowserawaiter     {         private readonly webbrowser _webbrowser;         private readonly string _url;          private readonly taskawaiter<string> _innerawaiter;          public bool iscompleted         {                         {                 return _innerawaiter.iscompleted;             }         }          public webbrowserawaiter(webbrowser webbrowser, string url)         {             _url = url;             _webbrowser = webbrowser;             _innerawaiter = processurlawaitable(_webbrowser, url);         }          public string getresult()         {             return _innerawaiter.getresult();          }          public void oncompleted(action continuation)         {             _innerawaiter.oncompleted(continuation);         }          private taskawaiter<string> processurlawaitable(webbrowser webbrowser, string url)         {             taskcompletionsource<string> taskcompletionsource = new taskcompletionsource<string>();             var handler = new webbrowserdocumentcompletedeventhandler((s, e) =>             {                 // todo: put custom processing of document here                 taskcompletionsource.setresult(e.url + ": " + webbrowser.document.title);             });             webbrowser.documentcompleted += handler;             taskcompletionsource.task.continuewith(s => { webbrowser.documentcompleted -= handler; });              webbrowser.navigate(url);             return taskcompletionsource.task.getawaiter();         }     }      public form1()     {         initializecomponent();     }      private void button1_click(object sender, eventargs e)     {         processurlsasync(new[] { "http://google.com", "http://microsoft.com", "http://yahoo.com" })             .start();     }      private task processurlsasync(string[] urls)     {         return new task(() =>         {             foreach (string url in urls)             {                 var awaiter = new webbrowserawaiter(webbrowser1, url);                 string result = awaiter.getresult();                  messagebox.show(result);             }         });     } }        } 

the problem when this:

        private task processurlsasync(string[] urls)     {         return new task(() =>         {             foreach (string url in urls)             {                 var awaiter = new webbrowserawaiter(webbrowser1, url, this.currentkunde);                 string result = awaiter.getresult();                 if (result != "failed")                 { break; }                 else                 {                     messagebox.show(result);                 }             }         });     }  private taskawaiter<string> processurlawaitable(webbrowser webbrowser, string url)     {         taskcompletionsource<string> taskcompletionsource = new taskcompletionsource<string>();         var handler = new webbrowserdocumentcompletedeventhandler((s, e) =>         {             // todo: put custom processing of document here             if (webbrowser.document.title == "title")             {                         webbrowser.scripterrorssuppressed = false;                         webbrowser.document.getelementbyid("name").setattribute("value", this._currentcustomer.displayedname);                         webbrowser.document.getelementbyid("email").setattribute("value", this._currentcustomer.email);                          //turns off checkinput()                         webbrowser.document.getelementsbytagname("form")[2].setattribute("onsubmit", "");                          //clicks on submit button                         webbrowser.document.getelementbyid("sendbutton").invokemember("click");             }             else             {                 //do other stuff , return "success"              }             taskcompletionsource.setresult("failed");         }); 

how can make handler fired again after ckick, return "success" , stop loop?