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A designing model and implementing method of an Internet-based system for C Language Learning is proposed in the paper, which based on .NET platform. The communication between the system and the compiler of C Language is implemented by using redirect technology. More powerful compile and logic error-check function are provided in the system, which adopts C# Multi-thread technology and synchronous control theory. Object-Oriented design methods and C# Reflection technology are used to solve the problem of dynamic test-case scheduling, which makes the system be extensible and robust. In the platform, users can learn C language knowledge and do C program. Especially, they can find out the logic errors which are bugs and can not be discovered by the compiler in programs. Once the users can gain access to the Internet, they can get hints and extra help easily through the interactive system at anytime and in anyplace. [ABSTRACT FROM AUTHOR]