Programatically adding items to SharePoint List

protected void btnAdd_Click(object sender, EventArgs e)
{
      SPSite site = new SPSite("http://abc-pc");

      SPWeb web = site.RootWeb;
      SPList list = web.Lists["Employee"];

      SPListItem li = list.Items.Add();
      li["Title"] = txtEmployeeName.Text;
      li["Location"] = txtLocation.Text;
      li.Update();
}