wpf - How bind IList with many items to Datagrid without freezing -

hi parse txt file list , want bind collection wpf datagrid control.

txt file contain 18 000 - 19 000 rows. here sample of txt file.

910839320   hovory vo vps   24.05.2011 08:52    0910839253  vps     stÁla   00:01:03            0,0488   910839320   hovory vo vps   26.05.2011 10:01    0910839267  vps     stÁla   00:01:00            0,0465   910839320   hovory vo vps   26.05.2011 10:04    0910839263  vps     stÁla   00:00:19            0,0147 

i parse text file ilist function.

    public class call     {         public string number { get; set; }         public string calltype { get; set; }         public string dt { get; set; }         public string callingnumber { get; set; }         public string voicenetwork { get; set; }         public string type { get; set; }         public string talktime { get; set; }         public string price { get; set; }     }      private static ienumerable<call> parse(string path)     {         var calls = new list<call>();          string[] lines = system.io.file.readalllines(path);          (int = 0; < lines.length; i++)         {             string[] line = lines[i].split('\t');              var call = new call                            {                                number = line[0],                                calltype = line[1],                                dt = line[2],                                callingnumber = line[3],                                voicenetwork = line[4],                                type = line[6],                                talktime = line[7],                                price = line[10]                            };             calls.add(call);         }          return calls;     } 

parsing ok.

problem if try bind output of mehod parse datagrid control. wpf freeze.

i use wpf, .net 4 , caliburn micro mvvm framework.

here problem code:

xaml:

        <stackpanel orientation="vertical" grid.column="1">             <datagrid name="calls"/>         </stackpanel> 

viewmodel:

        public ilist<call> calls         {             { return _class; }             set             {                 _class = value;                 notifyofpropertychange(()=>calls);             }         }          public void opentsv()         {             task.factory.startnew(() =>             {                 var dlg = new microsoft.win32.openfiledialog  { defaultext = ".tsv", filter = "tsv documents (.tsv)|*.tsv" };                  bool? result = dlg.showdialog();                  ilist<call> calls = new list<call>();                  if (result == true)                 {                     path = dlg.filename;                     calls = tsvparser.parse(path);                 }                  execute.onuithread((system.action)(() =>                 { calls = calls; }));             });          } 

how bind property calls viewmodel datagrid control without freezing?

a possible answer not load 18000 items. no person through items before filtering down more manageable number anyway.