CueProvider is a tiny class that lets you set a cue banner (the grey prompt text that automatically disappears when you begin to type) in a TextBox control.
自己做的计算器,功能还算过得去吧,分为三大部分:1、输入数据类型转换;2、常规基本运算;3、进制转换。-own calculator, it functions passably divided into three parts : an input data type conversion; 2, the conventional basic arithmetic; 3, the base for the conversion.