C#中 实现 button1 数据库查出来 在datetimepicker1和 datetimepicker2时间之间 结果显示在textbox1中 数据库 InterSystems CACHE 名称 dhc-app 地址 10.160.5.21 用户名 _system 密码

C is a high-level programming language that was developed in the early 1970s by Dennis Ritchie at Bell Labs. It is a general-purpose language that is widely used in developing system software, application software, and embedded systems.

C is a structured programming language that allows developers to write efficient and reliable code with a high degree of control over computer hardware. It provides features such as low-level memory manipulation, direct access to hardware, and a rich set of operators, data types, and control structures.

C has influenced many other programming languages, including C++, Java, and Python. It is still widely used today, especially in operating systems, device drivers, and embedded systems. C is also popular among developers who want to write high-performance code for applications such as games or scientific simulations.