update username doesnt show up in Masterpage

I have changed code in manage.aspx to update username. That seems to work, when i look in db.
BUT after redriect same old username Shows up in top status bar
Dim usermanager = Context.GetOwinContext().GetUserManager(Of ApplicationUserManager)()       Dim usr = Await usermanager.FindByIdAsync(User.Identity.GetUserId()) usr.UserName = aliasname.Text Dim ret = Await usermanager.UpdateAsync(usr) If ret.Succeeded = False Then      fehlermeldung.Visible = True      fehlermeldung.Text = ret.Errors.FirstOrDefault.ToString    Else      Response.Redirect("/default") End If