在用C#编写Windows程序时经常使用ComboBox控件，但此控件列表项只有text属性，与HTML中SELECT控件很不一样，使用很不方便，此代码就可以为ComboBox控件添加value属性！-With C# Preparation Windows programs often use ComboBox controls, but this controls only the list item text attributes, and HTML controls are very di