The code for the Button Click event is as follows, note the use of the sensible names for the TextBox controls.
用于ButtonClick事件的代码如下，注意TextBox控件的合理名称的使用。
If the user changes the value in a textbox or switches the selected element in a dropdown list, you can register an event handler and have code execute when the event is raised.
如果用户改变了文本框中的值或切换了下拉列表中的选定元素，您就能够注册一个事件处理程序，引发事件时，执行代码。
If the user changes the value in a textbox or switches the selected element in a dropdown list, you can register an event handler and have code execute when the event is raised.
如果用户改变了文本框中的值或切换了下拉列表中的选定元素，您就能够注册一个事件处理程序，引发事件时，执行代码。
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