DropDownList数据绑定及SelectedValue DataTextField 用法

DataTable dt = new DataTable("cart");
DataColumn dc1 = new DataColumn("name", Type.GetType("System.String"));
DataColumn dc2 = new DataColumn("index", Type.GetType("System.Int16"));
dt.Columns.Add(dc1);
dt.Columns.Add(dc2);

//以上代码完成了DataTable的构架，但是里面是没有任何数据的
for (int i = 0; i < 10; i++)
{
DataRow dr = dt.NewRow();
dr["name"] = "第"+i+"页";
dr["index"] = i;
}
this.DropDownList1.DataValueField = "index";
this.DropDownList1.DataTextField = "name";
this.DropDownList1.DataSource = dt;
this.DropDownList1.DataBind();
this.DropDownList1.SelectedValue=dr["news_type"].ToString();
this.DropDownList1.SelectedValue=dr["news_sort"].ToString();