Hide Delete Button in ASP.Net ListView for Non loggedin users

I have a ListView in my system.. 

And inside it, there is a button called "Delete". 

In the behind code, I tried to access the button control in the listview. However, the code keep looping non-stop..  

The logic is the Delete button will only be visible by the current logged-in user. And I had already set the button as visible = false. I had set breakpoint to the line : Delete.Visible = true;. Once the execution reach here, it loop back to the first line again..  

And Delete button remain invisble despite the execute visible = true statement.. 

Here is the code: 

  protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
    {

        MembershipUser currentUser = Membership.GetUser();
        Guid currentUserId = (Guid)currentUser.ProviderUserKey;

        if (e.Item.ItemType == ListViewItemType.DataItem && currentUser != null)
        {
            Button Delete = (Button)e.Item.FindControl("Delete");
            Delete.Visible = true;
            
        }

       
    }