c# - WPF DataGrid SelectAll Checkbox with two-way binding -

i'm binding datagrid list, has boolen property "isselected".

public partial class mainwindow : window {   list<baselineentity> _blrecs;    public mainwindow()   {     initializecomponent();      _blrecs = new list<baselineentity>();      _blrecs.add(new baselineentity{entityid = "yada_yada_1", isselected = false});     _blrecs.add(new baselineentity{entityid = "yada_yada_2", isselected = false});     _blrecs.add(new baselineentity{entityid = "yada_yada_2", isselected = false});      changedblrecsgridview.itemssource = _blrecs;   } } 

where class baselineentity defined as:

internal class baselineentity {     public string entityid {get; set;}     public bool isselected { get; set; } } 

the xaml this

<datagrid name="changedblrecsgridview"            itemssource="{binding _blrecs, mode=twoway, updatesourcetrigger=propertychanged}" autogeneratecolumns="false">     <datagrid.columns>         <datagridtextcolumn header="entity id" binding="{binding entityid}"></datagridtextcolumn>          <datagridtemplatecolumn width="30">             <datagridtemplatecolumn.celltemplate>                 <datatemplate>                     <checkbox ischecked="{binding path=isselected, updatesourcetrigger=propertychanged}" />                 </datatemplate>             </datagridtemplatecolumn.celltemplate>             <datagridtemplatecolumn.header>                 <checkbox name="chkselectall" checked="chkselectall_checked" unchecked="chkselectall_unchecked"></checkbox>             </datagridtemplatecolumn.header>         </datagridtemplatecolumn>     </datagrid.columns> </datagrid> 

where event handlers checked , unchecked events of select-all checkbox this:

private void chkselectall_checked(object sender, routedeventargs e) {     foreach (baselineentity enty in changedblrecsgridview.itemssource)     {         enty.isselected = true;     } }  private void chkselectall_unchecked(object sender, routedeventargs e) {     foreach (baselineentity enty in changedblrecsgridview.itemssource)     {             enty.isselected = false;     } } 

i'm familiar mvvm , know haven't stuck best practices (like implementing viewmodel), cuz i'm getting started wpf.

the check , uncheck event handlers set , reset isselected property, view not getting updated change. looks intended 2-way binding isn't happening somehow.

my guess should have implemented baselineentity class interface push notifications view (this i'd expect working knowledge on knockout js, couldn't find after spending hours).

i don't know whatelse i'm missing here.. not find solution.

any help/guidance appreciated..

thank you!

refer below model code inotifypropertychanged

 internal class baselineentity:inotifypropertychanged {     public string entityid { get; set; }      private bool isselected;      public bool isselected     {         { return isselected; }         set { isselected = value; onpropertychanged("isselected"); }     }      public event propertychangedeventhandler propertychanged;     private void onpropertychanged(string propname)     {         if (propertychanged != null)         {             propertychanged(this, new propertychangedeventargs(propname));         }     } }