第一种方法：
DataTable dt = new DataTable();
dt.Columns.Add("name");
dt.Columns.Add("value");
DataRow dr = dt.NewRow();dr[0] = "活动";
dr[1] = "1";
dt.Rows.Add(dr);DataRow dr1 = dt.NewRow();dr1[0] = "生活";
dr1[1] = "2";
dt.Rows.Add(dr1);
this.comboBox1.DataSource = dt;
this.comboBox1.DisplayMember = "name";
this.comboBox1.ValueMember = "value";
//调用方法：//string _value = comboBox1.SelectedValue.ToString();
第二种：
//首先添加一个ComboBoxItem类
public class ComboBoxItem
{ private string _text = null;
private object _value = null;
public string Text
{ get { return this._text;
} set { this._text = value;
} } public object Value
{ get { return this._value;
} set { this._value = value;
} } public override string ToString()
{ return this._text;
}}//赋值方法
ComboBoxItem newitem = new ComboBoxItem();
newitem.Text = "男";
newitem.Value = "1";
ComboBoxItem newitem1 = new ComboBoxItem();
newitem1.Text = "女";
newitem1.Value = "0";
com_sex.Items.Add(newitem);
com_sex.Items.Add(newitem1);
//调用方法：
ComboBoxItem sex_item = (ComboBoxItem)com_sex.SelectedItem; int com_sex_value = Convert.ToInt32(sex_item.Value);
string _Name = sex_item.Text;
第三种：
//首先添加一个SetCls类
public class SetCls
{
private string ID;
private string NAME; public SetCls(string pid,string pName)
{ this.ID =pid;
this.NAME =pName;
} public string pID
{ get{ return ID;}
} public string pName
{ get{ return NAME;}
}}//赋值方法：(使用ArrayList 要先引用命名空间using System.Collections;)
ArrayList lists = new ArrayList();
lists .Add(new SetCls ("1", "活动"));
lists .Add(new SetCls ("2", "生活"));
this.COMBOX.DisplayMember = "pID";
this.COMBOX.ValueMember = "pName";
this.COMBOX.DataSource = lists;
//调用方法：
stringcom_sex_value = COMBOX.SelectedValue.ToString();
我用DataSet填充的数据库中的内容（我这个是直接赋值，并不像上面三个添加值给ComBox）
DataSet ds_zubie = new DataSet();
da = new SqlDataAdapter(sql_zubie, PublicDB.DBzbw);
da.Fill(ds_zubie, "zubie");
com_paidan.DataSource = ds_zubie.Tables["zubie"].DefaultView;//绑定数据源
com_paidan.ValueMember = "zubie_id";//赋值Value
com_paidan.DisplayMember = "zubie_name";//赋值显示名称
//调用方法：
stringcom_zubie_id = com_paidan.SelectedValue.ToString();