DNN custom logout

protected void LinkButton1_Click(object sender, EventArgs e)
{
DotNetNuke.Security.PortalSecurity.ClearRoles();

Session.Clear();

Session.Abandon();

PortalSecurity objPS = new PortalSecurity();

objPS.SignOut();
Response.Redirect("http://localhost:2887/Site/Home/tabid/39/language/en-US/Default.aspx");
}