c# - Cannot refresh DataGrid in WPF using PRISM 5, MVVM, and EF 6 -

my problem seems common one, yet, of posts have read - both here , on other sites - still have not found solution.

i have simple data-entry wpf module - 2 textboxes, 3 comboboxes, 1 datagrid, , submit , clear buttons. (the app/form creating general ledger accounts in accounting db.) builing entire solution using prism 5. (this first foray remotely complicated, , is, @ moment, proof-of-concept endeavor.) anyway, iam binding wpf screens (usercontrol/views) appropriate viewmodels. viewmodel in turn obtains data msss db via ef 6 entities (db first). when user opens particular wpf screen datagrid shows existing records in database.

with 1 exception submit (new record) procedure works want: new entry pushed through msss db, text boxes cleared, , comboboxes reset. want, however, 1) datagrid refresh, showing new record, , 2) new record highlighted in grid. life of me cannot working, though. note: may make difference datagrid bound view, rather table, in db. (again, datagrid displays correctly when app first opens.)

so, how datagrid update?????

here (condensed) xaml wpf view:

    <usercontrol x:class="acctmappingwpfmodule.views.createglacctsview"          other namespace declarations...          xmlns:vms="clr-namespace:acctmappingwpfmodule.viewmodels"> <usercontrol.datacontext>         <vms:createglacctsviewmodel />     </usercontrol.datacontext>     ...      <stackpanel ...>     <!-- layout controls 2 text boxes & 3 comboboxes -->         ...     <!-- data grid of genl ledger accts -->     <datagrid x:name="dgglaccts"          isreadonly="true"         selectionunit="fullrow"         ...             itemssource="{binding path=glaccounts}" />     <wrappanel >         <!-- submit & clear buttons here -->     </wrappanel> </stackpanel> 

here (condensed) viewmodel code (try/catch blocks omitted):

    namespace acctmappingwpfmodule.viewmodels 

{ public class createglacctsviewmodel : bindablebase, icreateglacctsviewmodel { private tbloadentities context; private int _glacctid = 0; // other private fields...

// ctor...     public createglacctsviewmodel( )     {         this.submitcommand = new delegatecommand(onsubmit);          // populate icollectionviews - i.e., properties...         using (context = new tbloadentities())         {             // 3 properties behind comboboxes populated, datagrid ppt...             list<vwglacct> accts = new list<vwglacct>();             accts = (from in context.vwglacct select a).tolist<vwglacct>();             glaccounts = collectionviewsource.getdefaultview(accts);         }          // hook selection change delegates, including...         glaccounts.currentchanged += glaccounts_currentchanged;     }      private void onsubmit()     {         glaccount glacct = new glaccount()         {     // various properties set, then...             glfsaccttypecombofk = this.selectedfsaccttypecomboid         };         using (context = new tbloadentities())         {     context.glacct.add(glacct);     context.savechanges();     // vwglacct ef entity of msss db view...     list<vwglacct> accts = new list<vwglacct>();             accts = (from in context.vwglacct select a).tolist<vwglacct>();             glaccounts = collectionviewsource.getdefaultview(accts);             selectedglacctid = glacct.glacctid;             glaccounts.refresh();     }     }      private void glaccounts_currentchanged(object sender, eventargs e)     {         vwglacct current = glaccounts.currentitem vwglacct;         selectedglacctid = current.glacctid;     }      public icommand submitcommand { get; private set; }      public int selectedglacctid     {                 { return _glacctid; }         set         {             setproperty(ref _glacctid, value);         }     }      public icollectionview glaccounts { get; private set; } } 

}

1) why getting default view again? (collectionviewsource.getdefaultview(accts)) after submit? make sure accts observablecollection , default view once, hit refresh it.

2) code behind of window? if so, dgglaccts.getbindingexpression(datagrid.itemssourceproperty).updatetarget()