重寫ComboBox的OnkeyUp方法

　　      using System;
    using SystemCollectionsGeneric;
    using SystemText;

　　namespace winform
    {
        public class OurComBox : SystemWindowsFormsComboBox
        {
            //==============overwrite ComboBox OnkeyUp method
            protected override void OnKeyUp(SystemWindowsFormsKeyEventArgs e)
            {
                foreach (object item in thisItems)
                {
                    string[] strs = itemToString()Split(ToCharArray());//利用空格來分格字符串
                    if (strs[]Trim()Equals(thisText))//如果輸入的值等於前面的編號
                    {
                        thisSelectedItem = item;
                        thisSelectAll();
                    }
                }
                baseOnKeyUp(e);
            }
            //=================
        }
    }

From:http://tw.wingwit.com/Article/program/net/201311/11391.html