this is my code:
sdsNamaSales.SelectCommand = "SELECT ID, NAMA FROM REF_SALES_OFFICER WHERE" +
" SOF_TYPE = '" + ddlJenisSales.SelectedValue + "' AND KOT_ID = '" + ddlKota.SelectedValue + "'";
// insert nama sales manual
ddlNamaSales.Items.Clear();
ddlNamaSales.DataSource = sdsNamaSales;
ddlNamaSales.DataTextField = "NAMA";
ddlNamaSales.DataValueField = "ID";
ddlNamaSales.DataBind();
ddlNamaSales.Items.Insert(0, new ListItem("--PILIH--", "--PILIH--"));
i want to set value ID in ddlNamaSales.DataTextField = "NAMA", now ddlNamaSales.DataTextField = "ID - NAMA"