Code
this.cmbConsumeSuperMarket.DataSource = dtSuperMarket;
this.cmbConsumeSuperMarket.DisplayMember = "Name"; this.cmbConsumeSuperMarket.ValueMember = "ID"; this.cmbConsumeSuperMarket.SelectedIndex = 0;

StringTools.ObjectToInt(this.cmbConsumeSuperMarket.SelectedValue);
StringTools.ObjectToStr(this.cmbConsumeSuperMarket.SelectedText);

Code
using System.Data;
using System.Windows.Forms;

namespace BlackCore.App.Method
{
    //抽象类 DataBindControls 引入抽象方法 dataBindComboBox(……)
    public abstract class DataBindControls
    {
        /// <summary>
        /// 绑定ComboBox
        /// </summary>
        /// <param name="cmb">ComboBox Control</param>
        /// <param name="isInsertDefaultItem">是否为此控件插入一个默认选项且默认选中</param>
        /// <param name="dt">需要绑定的DataTable</param>
        /// <param name="selectedText">显示文字(DisplayMember)</param>
        /// <param name="selectedValue">ValueMember</param>
        public abstract void dataBindComboBox(ComboBox cmb, bool isInsertDefaultItem, DataTable dt, string selectedText, string selectedValue);
    }
}

Code
using System.Data;
using System.Windows.Forms;
using BlackCore.FinancialLibrary;

namespace BlackCore.App.Method
{
    //实现抽象
    //类 DataBindControlsImplement 重写 dataBindComboBox，并提供一个具体实现。
    //由于 DataBindControlsImplement 中没有了抽象成员，因此可以（但并非必须）将 DataBindControlsImplement 声明为非抽象类。
    public class DataBindControlsImplement : DataBindControls
    {        
        public override void dataBindComboBox(ComboBox comboBox, bool isInsertDefaultItem, DataTable dataTable, string selectedText, string selectedValue)
        {
            if (dataTable != null && dataTable.Rows != null && dataTable.Rows.Count > 0)
            {
                if (comboBox.Items.Count > 0)
                {
                    comboBox.Items.Clear();
                }
                int i = 1;
                foreach (DataRow dataRow in dataTable.Rows)
                {
                    //comboBox.SelectedText = StringTools.ObjectToStr(dataRow[selectedText]).Trim ();
                    //comboBox.SelectedValue = StringTools.ObjectToInt(dataRow[selectedValue]).ToString ();

//BlackCore.BLL.FinancialManage.FMProject bllProject = new BlackCore.BLL.FinancialManage.FMProject();
                    //BlackCore.Model.FinancialManage.FMProject modelProject = new BlackCore.Model.FinancialManage.FMProject();
                    //modelProject = bllProject.GetModel(StringTools.ObjectToInt(dataRow["ID"]));

//用如下这种方式就只有selectedText，而没有selectedValue
                    //comboBox.Items.Add(StringTools.ObjectToStr(dataRow[selectedText]).Trim());

//可以存储在ComboBox中的任何种类的对象，而不是字符串。重写toString（）方法生成的文本框将显示。
                    //这样就可以实现selectedText，selectedValue或更多需要的属性
                    comboBox.Items.Add(new ComboBoxItemTextValue(StringTools.ObjectToInt(dataRow[selectedValue]).ToString(), StringTools.ObjectToStr(dataRow[selectedText])));
                }
                if (isInsertDefaultItem)
                {
                    comboBox.Items.Insert(0, "请选择");
                }
                comboBox.SelectedIndex = 0;
            }            
        }

public class ComboBoxItemTextValue
        {
            public string selectText;
            public string selectValue;

public ComboBoxItemTextValue(string _selectValue, string _selectText)
            {
                selectValue = _selectValue;
                selectText = _selectText;
            }
            public override string ToString()
            {
                return selectText;
            }
        }

}
}

Code
DataBindControlsImplement implement = new BlackCore.App.Method.DataBindControlsImplement();

implement.dataBindComboBox(this.searchCmbConsumeMarket, true, bllMarket.GetList("").Tables[0], "Name", "ID");

Code
if (StringTools.ObjectToInt(searchCmbConsumeMarket.SelectedIndex) != 0)
{
    DataBindControlsImplement.ComboBoxItemTextValue comboItem = 
        (DataBindControlsImplement.ComboBoxItemTextValue)this.searchCmbConsumeProject.SelectedItem;
        string selectedText = comboItem.selectText;
        int selectedValue = comboItem.selectValue;
}