Page not redirecting to previous page using Session in ASP.Net

   protected void lblNVariz_Click(object sender, EventArgs e)
    {
        Session["Page"] = "~/Admin.aspx";
        Response.Redirect("Admin/Bank-Data.aspx");
    }

but when I click on link button it didn't redirect to Bank_data.aspx page it just refresh admin.aspx page

but when I change code Like below

  protected void lblNVariz_Click(object sender, EventArgs e)
    {
        
        Response.Redirect("Admin/Bank-Data.aspx");
    }

it redirect to Bank_data.aspx page

When I put session on it, it didn't worked...