DropDownList1.DataSource = listSort;
DropDownList1.DataTextField = "LogSortName";
DropDownList1.DataValueField = "LogSortID";
DropDownList1.DataBind();
DropDownList1.SelectedIndex = ddl.Items.IndexOf(DropDownList1.Items.FindByValue("i"));
//i要自己去獲取你要顯示的項的id。