c# - Updating datagrid WPF -

i have created window:

when add new user, delete or update, applies server. doesn't update datagrid below. here 1 of functions :

private void delete_button_click(object sender, routedeventargs e) {     using(var ctx = new personelcontext())     {         personelentity personel = (             s in ctx.personels                 s.name == namebox.text                 select s).firstordefault();         ctx.personels.remove(personel);         ctx.savechanges();     }                              this.personelentitydatagrid.items.refresh();  } 

as see i'm refreshing datagrid still doesn't show new results. how can fix this?

mvvm exemple

let's have got windows datagrid :

<window x:class="wpfapplication7.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">     <datagrid itemssource="{binding personels}">         <datagrid.columns>             <datagridtextcolumn header="nom" binding="{binding nom}" width="200"></datagridtextcolumn>          </datagrid.columns>     </datagrid> </window> 

we have define datacontext (or binding won't know find) :

namespace wpfapplication7 {     public partial class mainwindow : window     {         public mainwindow()         {             initializecomponent();              this.datacontext = new mainviewmodel(this);         }     } } 

then can define viewmodel (datacontext of windows) :

class mainviewmodel : viewmodelbase     {         /// <summary>         /// référence de la fenêtre principale         /// </summary>         private mainwindow mainwindow;          /// <summary>         /// liste des personels         /// </summary>         private observablecollection<personel> personels = new observablecollection<personel>();           public observablecollection<personel> personels         {                          {                 return personels;             }         }          /// <summary>         /// constructeur de la classe         /// </summary>         /// <param name="mainwindow">référence de la fenêtre principale</param>         public mainviewmodel(mainwindow mainwindow)         {             this.mainwindow = mainwindow;              addpersonel("toto");              addpersonel("jack");              addpersonel("momo");              addpersonel("momo");              addpersonel("momo");              addpersonel("momo");         }          private void addpersonel(string namepersonel)         {             personels.add(new personel() { name = namepersonel });             onpropertychanged("personels");         }     }      class personel     {         private string name = "noname";          public string name         {             { return name; }             set { name = value; }         }     } 

mainviewmodel must implement inotifypropertychanged notifies controls property value has changed. :

public abstract class viewmodelbase : inotifypropertychanged     {         public event propertychangedeventhandler propertychanged;          protected virtual void onpropertychanged(string propertyname)         {             if (this.propertychanged != null)             {                 this.propertychanged(this, new propertychangedeventargs(propertyname));             }         }     }