Lambda expression is slower than foreach statement?

I did a small experiment to test whether lamdba expression can retrieve faster results than foreach statement. but, Lambda failed

System.Diagnostics.Stopwatch st = new System.Diagnostics.Stopwatch();
        st.Start();
        List<int> lst = new List<int>();
        foreach (GridViewRow item in GridView1.Rows)
        {
            if (((CheckBox)item.FindControl("Check")).Checked)
            {
                lst.Add(Convert.ToInt32(((Label)item.FindControl("Id")).Text));
            }
        }
        st.Stop();
        Response.Write(st.Elapsed.ToString());
        Response.Write("<br/><br/><br/>");
        st.Reset();
        st.Start();
        List<int> lstRank = GridView1.Rows.OfType<GridViewRow>().Where(s => ((CheckBox)s.FindControl("Check")).Checked)
                                                                     .Select(s => Convert.ToInt32(((Label)s.FindControl("Id")).Text)).ToList();
        st.Stop();
        Response.Write(st.Elapsed.ToString());
        int i = 0;


output
00:00:00.0000249


00:00:00.0002464 

why lambda is slower than foreach. This may be a drawback of lambda expression