ASP.NET怎样把datalist里面的时间排序啊！！

protected void DropDownList6_SelectedIndexChanged(object sender, EventArgs e)
  {
  if (this.DataList1.DataSource != null)
  {
  if (this.DropDownList6.SelectedValue == "日期")
  {
  List<ShowProduct> listShow = (List<ShowProduct>)this.DataList1.DataSource;
  List<ShowProduct> list2 = new List<ShowProduct>();
  for (int i = 0; i < listShow.Count; i++)
  {
  for (int j = i+1; j < listShow.Count; j++)
  {
  if (listShow[i].Create_date < listShow[j].Create_date)
  {
  list2.Add(listShow[i]);
  listShow[i].Create_date = listShow[j].Create_date;
  listShow[j].Create_date = list2[i].Create_date;
  }
  }
  }
  this.DataList1.DataSource = null;
  this.DataList1.DataSource = listShow;
  this.DataList1.DataBind();
  }
  }
  }
为什么我循环的把时间全改为一样的了！！求高手赐教啊！在线=回答

C# code

List<ShowProduct> listShow = ((List<ShowProduct>)this.DataList1.DataSource).OrderBy(p => p.Create_date).ToList<ShowProduct>();