What Is a Partial Class?

In C # 1.x, it is required that all code in the class must be centralized and placed in a folder. Although it is a good programming requirement to maintain all the code of a class in a file, in some cases, for example, the class becomes complicated and the code is verbose. Unrealistic constraints. In addition, developers often use a code generator to generate the initial structure of an application and then modify the generated code. Unfortunately, when the source code needs to be released again later, existing fixes will be rewritten.