How to set value to comboBox

Always has some confusion about set values to ComboBox, few minutes ago,I spent some time on this. Figure it out and blog this.

The following is part of the code:

        private string[] GetName()
        {
            string[] strName={"Allen","Cathy","Annie","Eric","Sinon"};
            return strName;
        }
        private void btn_Click(object sender, EventArgs e)
        {
            string[] Name = GetName();
            DataTable dt = new DataTable();
            dt.Columns.Add("ID",typeof(string));
            dt.Columns.Add("Name", typeof(string));
            for (int i = 0; i < 5; i++)
            {
                DataRow dr = dt.NewRow();
                dr["ID"] = i;
                dr["Name"] = Name[i];
                dt.Rows.Add(dr);
            }
            comlist.DataSource = dt;
            comlist.DisplayMember = "Name";//this will display in the ComboBox
            comlist.ValueMember = "ID";//this is the selectedvalue
        }

        private void comlist_SelectedValueChanged(object sender, EventArgs e)
        {
            string value1 = comlist.SelectedValue.ToString();

        }

 

Notes:

No matter give some value to ComboBox.SelectedValue or get vaule from this, this ComboBox need bind some datasource. Otherwise null exception will be thrown out