combox绑定数据

 HSMobile_Function.HSMobile_ProjectIDSelect(ProjectID, out dt_Machine);//取出表数据
            comboBox_Machine.DataSource = dt_Machine;
            comboBox_Machine.DisplayMember = "机床图号";
            comboBox_Machine.ValueMember = "机床流水号";

comboBox_Machine.SelectedIndex = 0;