WPF - Binding problem -

why after clicking button text in textblock doesn't change ?

xaml:

 <grid>     <grid.rowdefinitions>         <rowdefinition/>         <rowdefinition/>     </grid.rowdefinitions>      <textblock text="{binding name}"/>     <button click="button_click" grid.row="1" margin="20">click me</button> </grid> 

code behind:

  public partial class window1 : window, inotifypropertychanged {     private person _myperson;     public person myperson     {         { return _myperson; }         set         {             _myperson = value;             if (propertychanged != null)             {                 propertychanged(this, new propertychangedeventargs("myperson"));             }         }     }      public window1()     {         myperson = new person { name = "a" };         datacontext = myperson;         initializecomponent();     }      private void button_click(object sender, routedeventargs e)     {         myperson = new person { name = "b" };     }      #region inotifypropertychanged members      public event propertychangedeventhandler propertychanged;      #endregion } 

<textblock text="{binding name}"/> 

in above code bind property name text box , in following code:

private void button_click(object sender, routedeventargs e) {     myperson = new person { name = "b" }; } 

you set myperson new person.

is intended? , person class implement inotifypropertychanged event?

you updating myperson property. datacontext still has reference object create using following line:

myperson = new person { name = "a" }; 

in constructor. need update datacontext well.

instead, use following code:

private void button_click(object sender, routedeventargs e) {     myperson = new person { name = "b" };     datacontext = myperson; }