c# - Best way to notify ui what's happening on another thread in wpf? -

i'm using mvvm, , in viewmodel start thread (it server application, connection thread), , i'm looking appropriate way (or ways (!)) notify ui what's happening on thread. way want it, have textbox of sort logs (lines stored in observablecollection probably), , each time happens on connection thread, want new line added textbox. here's how set command (the method starts thread listening connections):

public viewmodel() {     startcommand = new relaycommand(packethandler.start); } 

packethandler class:

    public static void start()     {         var connectionthread = new thread(startlistening);         connectionthread.isbackground = true;         connectionthread.start();     }      private static void startlistening()     {         if (!isinitialized) initialize();         try         {             listener.start();             while (true)             {                 client = listener.accepttcpclient();                 // kind of logging here reaches ui                  var protocol = new protocol(client);                 var thread = new thread(protocol.startcommunicating) { isbackground = true };                 thread.start();                 connectedthreads.add(thread);             }         }         catch (exception)         {             // temp             messagebox.show("error in packethandler class");         }     } 

i'm looking possible solutions, preferably best. i'm beginner programmer, may not comprehend complex solutions, please bear in mind this, too. note: read events, observer pattern, , few other things possible solutions, don't know (and of course: how) use them properly. in advance!

one more similar working example

view

<window x:class="multipledatagrid.mainwindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         title="mainwindow" height="350" width="525">     <stackpanel>         <scrollviewer maxheight="100">             <itemscontrol itemssource="{binding serverlog}">                 <itemscontrol.itemtemplate>                     <datatemplate>                         <textblock text="{binding}"/>                     </datatemplate>                 </itemscontrol.itemtemplate>             </itemscontrol>         </scrollviewer>     </stackpanel> </window> 

view codebehind

using system.windows;  namespace multipledatagrid {     public partial class mainwindow : window     {         public mainwindow()         {             initializecomponent();             this.datacontext = new viewmodel();         }     } } 

your serverthread

using system; using system.collections.objectmodel; using system.threading; using system.windows; using system.windows.data;  namespace multipledatagrid {     public class     {         public static void start()         {             var connectionthread = new thread(startlistening);             log = new observablecollection<string>();             bindingoperations.enablecollectionsynchronization(log, _lock);//for thread safety             connectionthread.isbackground = true;             connectionthread.start();         }          public static observablecollection<string> log { get; private set; }         private static readonly object _lock = new object();          private static void startlistening()         {             try             {                 int = 0;                 while (i <= 100)                 {                     log.add("something happened " + i);                     thread.sleep(1000);                     i++;                  }             }             catch (exception)             {                 // temp                 messagebox.show("error in packethandler class");             }         }     } } 

and viewmodel

using system.collections.objectmodel; using system.componentmodel;  namespace multipledatagrid {     public class viewmodel : inotifypropertychanged     {          public observablecollection<string> serverlog { get; private set; }          public viewmodel()         {             something.start();             something.log.collectionchanged += (s, e) =>                 {                     serverlog = something.log;                     raisepropertychanged("serverlog");                 };         }          public event propertychangedeventhandler propertychanged;         public void raisepropertychanged(string propname)         {             var pc = propertychanged;             if (pc != null)                 pc(this, new propertychangedeventargs(propname));         }     } }