The calling thread cannot access this object because a different thread owns it.

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C#

public void LoadData()
       {
           var manager = new ManageFactory&lt;ISmartDealerManager&gt;().GetManager();
           List&lt;DealerItem&gt; DealerCollection = manager.LoadDealerData();
           MainDataGrid.Items.Clear();
           MainDataGrid.ItemsSource = null;
           Thread.Sleep(2000);
           if (DealerCollection.Count() &gt; 0)
           {
               MainDataGrid.Items.Clear();
               this.Dispatcher.BeginInvoke(new Action(() =&gt;
               {
                   MainDataGrid.ItemsSource = DealerCollection;
                   lblError.Visibility = Visibility.Hidden;
               }), DispatcherPriority.Background);

           }
           else
           {
               MainDataGrid.ItemsSource = null;
               lblError.Visibility = Visibility.Visible;
           }
           EnableDisableItems();
           this.WaitingScreen.IsLoadingVisible = true;
       }
   }

Thread MyNewThread = new Thread(new ThreadStart(() =&gt; LoadData()));
            MyNewThread.IsBackground = true;
            MyNewThread.Start();

Here i am getting error at line " MainDataGrid.Items.Clear();"

and idea please.

Posted 17-Apr-14 21:58pm

Raman Midha

Updated 17-Apr-14 22:00pm

v3

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[no name] 18-Apr-14 9:39am

Idea for what? The error message is telling you exactly what the problem is.

1 solution

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Shai Vashdi · Answer 1 · 2014-04-18T06:19:00

Hi Raman,

The answer is very simple, you are trying to clear the MainDataGrid.Items outside of the UI thread.

You should change your code:

C#

if (DealerCollection.Count() >= 0)
{
  
    this.Dispatcher.BeginInvoke(new Action(() =>
    {
        MainDataGrid.Items.Clear();
        MainDataGrid.ItemsSource = DealerCollection;
        lblError.Visibility = Visibility.Hidden;
    }), DispatcherPriority.Background);

}</pre>