How to get the number of attributes associated with a node?

I am using a TreeView in WinForm, TreeView is binded to XML. When a User select a node I need to display the number of attributes for that node.

Any idea how to show this value?

   private void tr1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
    {
        // Get node relative level
        txtBoxRelativeLevel.Text = e.Node.Level.ToString();
        // Get total child nodes
        txtBoxDirectDescends.Text = e.Node.Nodes.Count.ToString();

    }

xml

<element atribut1="a" atribut2="b">text</element>