Binding a textBlock text to a value in a custom class xaml c# -

when navigate new page should display text, appears empty

the xaml code have

  xmlns:vm="using:estimation"     <page.datacontext>     <vm:playerclass/>   </page.datacontext> 

this textblock im trying bind data too.

  <textblock x:name="playerone"              text="{binding playeronename}"                 /> 

the class im binding follows

 public class playerclass :inotifypropertychanged {     public event propertychangedeventhandler propertychanged;      private void notifypropertchanged(string info)     {         if (propertychanged != null)             propertychanged(this, new propertychangedeventargs(info));             }      private string name;     public string playeronename { { return this.name; }                                   set { this.name = value ;                             notifypropertchanged(playeronename); } }  }} 

and class im changing content in text box is

        private void startbutton_click(object sender, routedeventargs e)     {              if (playeronetextbox.text == enternametext ||             playertwotextbox.text == enternametext ||                  playerthreetextbox.text == enternametext ||             playerfourtextbox.text == enternametext)         {             messagedialog msgbox = new messagedialog("please enter names before continuing");             msgbox.showasync();          }         else         {             //   playernames.propertychanged += new dependencypropertychangedeventhandler(playernames_propertychanged);            this.datacontex.playeronename = playeronetextbox.text;             messagedialog msgbox = new messagedialog(playernames.playeronename);             msgbox.showasync();               playernames.playertwoname = playertwotextbox.text;             playernames.playerthreename = playertwotextbox.text;             playernames.playerfourname = playerfourtextbox.text;            frame.navigate(typeof(newroundpage));         }     } 

in constructor set name

public playerclass () {    playeronename = "jabba de hutt"; } 

also set fallback value provide indicator of failed binding situation:

text="{binding playeronename, fallback=unknown}"  

the navigate should not change datacontext of textbox, change viewmodel instead

 protected override void onnavigatedto(navigationeventargs e)  {       var  playernames = e.parameter playerclass;        this.datacontext.playeronename = playernames.playeronename;     }