请教Winform里如何手动设置combobox的实际值

请问Winform里怎么手动设置combobox的实际值
例如　显示值为　a,b ,c　实际值为　1,2,3 
 不要求从数据库里取值而是手动添加，应该怎么实现？

[解决办法]

C# code

 DataTable dt = new DataTable();            dt.Columns.Add("DisplayValue");            dt.Columns.Add("Value");            DataRow dr = dt.NewRow();            dr["DisplayValue"] = "a";            dr["Value"] = "1";            dt.Rows.Add(dr);            dr = dt.NewRow();            dr["DisplayValue"] = "b";            dr["Value"] = "2";            dt.Rows.Add(dr);            dr = dt.NewRow();            dr["DisplayValue"] = "c";            dr["Value"] = "3";            dt.Rows.Add(dr);            comboBox1.ValueMember = "Value";            comboBox1.DisplayMember = "DisplayValue";            comboBox1.DataSource = dt;
[解决办法]
手动初始化：
C# code
string[] str = {"a","b","c"};this.comboBox1.Items.AddRange(str);this.comboBox1.SelectedIndex = 0;
[解决办法]
探讨

手动初始化：
C# codestring[] str={"a","b","c"};this.comboBox1.Items.AddRange(str);this.comboBox1.SelectedIndex=0;
取值的时候：
C# codeintvalue=this.comboBox1.SelectedIndex+1;