int aGroupID = 用户的组ID;
for(int i = 0; i < aTable.Rows.Count, i++){//aTable是绑定到DropDownList的Table
int aSelectID = aTable.Rows[i]["ID"];//组ID
if(aSelectID == aGroupID){
DropDownList1.SelectedIndex = i;
break;
}
}
for(int i = 0; i < aTable.Rows.Count; i++){//
}