ComBox控件的使用

 conn.Open();
            OleDbDataAdapter myDA2=new OleDbDataAdapter("select * from Grade", conn);
            myDA2.Fill(ds,"table");
            //绑定combox数据源
            comboBox1.DataSource=ds.Tables["table"];
            comboBox1.ValueMember ="Grade_ID";
            comboBox1.DisplayMember ="Grade_Name";
           
           conn.Close(); 

           int k =int.Parse(this.comboBox1.SelectedValue.ToString());//获取combox的选中值