企业电话客服系统：包括C#中调用API函数，使用C#开发语音卡，C#开发Access数据库，窗体的显示模式，各种控件的数据绑定。-Business telephone customer service system: including the API function in the C#, using C# voice card, C# Access database development, the display mode of the form, the data bound contr