WPF TreeView Binding

Bind Treeview in WPF

TreeView Xmal

   <treeview x:name= "Tvworkitem" grid.column= "0" grid.row= "2" background= "Black" itemssource= "{Bindi ng Menudatasource} "selecteditemchanged=" Treeview_onselecteditemchanged > <t Reeview.itemtemplate > <span style= "color: #ff0000;" >  
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ViewModel
 
Private observablecollection<menuitem> _menudatasource;  
       Public observablecollection<menuitem> menudatasource  
       {  
           get  
           {  
               if (_menudatasource = null)  
                   _menudatasource = Menuoperation.loadmenu ();  
      
               return _menudatasource;  
           }  
           Set  
           {  
               _menudatasource = value;  
               raisePropertyChanged (() => menudatasource);  
           }  
       
 
Entity
 
 public class MenuItem {public Guid Id {get; set;}  
      public string Name {get; set;}  
      public string Oriname {get; set;}  
      public bool Hasoutstandingtask {get; set;} Public <span style= "color: #ff0000;"  
      >ObservableCollection<MenuItem></span> ChildItems {get; set;}  
      public bool Isworkitemtype {get; set;}  
      Public WorkItemType Worktype {get; set;}  
  public bool Isworkitem {get; set;} }