Clear datagrid values in wpf

I need to flush my datagrid everytime when a treeviewitem is clicked. My code is given below.

private void treeView1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    this.dataGrid1.ItemsSource= null;
    String path =this.treeView1.SelectedItem;
    if (!File.Exists(path))
        MessageBox.Show("Not Found");

        //   String data = @"C:\logs.xml";
        string data = path;
        this.dataGrid1.ItemsSource = objref.Result;

But everytime when I click a treeview item datagrid is not cleared-- it's appended with incoming data. I used both dataGrid1.Columns.Clear() and dataGrid.ItemSource= null; How can i do this??


If you are populating the DataGrid by using:


Then you should be able to use:


To remove all the rows.

If you are binding to the ItemsSource like:

dataGrid.ItemsSource = someCollection;

Then you should be able to set the ItemsSource to null and it will remove all the rows.


Don't forget to refresh it:


I had a public Ienumerable collection which is appended everytime when the function is called. So by overwriting it i flushed the Data in my Datagrid..

You may consider using ObservableCollection<> class rather than IEnumerable<>.

ObservableCollection<User> users = new ObservableCollection<User>();
dataGrid1.ItemsSource = users;

You can clear the datagrid by using the below code.


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