.net - Javascript not executing from ASP.NET -


please @ code , find out why isnt working. not getting alert in webpage. but, console.writeline beneath getting executed.

    private void publishloop()     {         while (running)         {                       thread.sleep(5000);             dtmessages = (string)(cache.get(key));             if (dtmessages == null)             {                 //publish here                 dtmessages = loadmessages();                 system.diagnostics.debugger.log(0,null,dtmessages);                 page.clientscript.registerstartupscript(this.gettype(),"clientscript", "alert('hi');",true);                 console.writeline(dtmessages);             }         }       }

edit: can register 1 unique key per response. you're running line of code inside while loop, keeps registering same key. need give unique key parameter each time call function. in case, maybe can have counter in loop , append key string 

int = 0; while (running)         {                       thread.sleep(5000);             dtmessages = (string)(cache.get(key));             if (dtmessages == null)             {                 //publish here                 dtmessages = loadmessages();                 system.diagnostics.debugger.log(0,null,dtmessages);                 page.clientscript.registerstartupscript(this.gettype(),"clientscript" + i.tostring(), "alert('hi');",true);                 console.writeline(dtmessages);                 i++;             }         }

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