拖放，是指用鼠标拖动的方法，在不同程序的窗口之间、同一个程序的不同窗口之间或同一程序同一窗口的不同控件之间，进行移动、复制和粘贴等操作的技术。拖放操作是在操作系统的帮助下完成的。被拖动的对象首先向操作系统注册它使用的数据格式，并按指定的数据格式提供数据，拖放操作结束时，接收拖放的窗口按指定的数据格式提取有关数据，并根据提取的数据生成相应的对象。-Drag and drop, is the method of dragging with the mouse, the window in between the different procedures, the same program or the same between the different windows of different control procedures between the same window, to move, copy and pasting operations technology. Drag and drop operation is completed with the help of the operating system. Drag the object to be registered first to the operating system it uses the data format, data format according to the specified data, drag and drop the end of the drag and drop the window to receive the specified data format by extracting the relevant data and, based on data extracted generates the appropriate object.