How to activate listview item without click event in C#

// Case 1 : Works fine on click
this.listView1.ItemActivate += new System.EventHandler(this.OnListItemActivate);

public partial class Routes
{

    //Case 2 : I want to load tab page2
    public void Back_to_view_Route_page()
    {
    listView1.Items[1].Focused = true;
    listView1.Items[1].Selected = true;

    OnListItemActivate( null, null);
    }

  // works fine for case1 not for case2

    public void OnListItemActivate(object sender, EventArgs e)
    {

    if (listView1.FocusedItem == listView1.Items[0])
    {
    // Load tab page 1
    ----------
    this.tabControl1.SelectedIndex = 1;
    }
    else if (listView1.FocusedItem == listView1.Items[1])
    {
    // Load tab page 2
    -------------
    this.tabControl1.SelectedIndex = 2;
    }
  }
}