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Partial` classes span multiple files. How can you use the partial modifier on a C# class declaration? With partial, you can physically separate a class into multiple files. This is often done by code generators.`Example.` With normal C# classes, you cannot declare a class in two separate files in the same project. But with the partial modifier, you can. This is useful if one file is commonly edited and the other is machine-generated or rarely edited. `Partial is required here.` If you remove the partial modifier, you will get an error containing this text: [The namespace '<global namespace>' already contains a definition for 'A']. `Namespace `namespace`To fix this, you can either use the partial keyword, or change one of the class names.`Compiler.` How does the C# compiler deal with partial classes? If you disassemble the above program, you will see that the files A1.cs and A2.cs are eliminated. You will find that the class A is present. `So: `Class A will contain the methods A1 and A2 in the same code block. The two classes were merged into one.`Class `class`Partial classes are precisely equivalent to a single class with all the members.`Summary.` Partial classes can simplify certain C# programming situations. They are often used in Visual Studio when creating Windows Forms programs. The machine-generated C# code is separate. `Partial classes are sometimes used to separate commonly-edited code from rarely-edited code.`This can reduce confusion and the possibility that code that isn't supposed to be edited is changed.

ETOIROOTJTAO{OET%E{OEEA.A1();OEEA.A2();OE}O}OORContents of file A1.cs: C#ROOTDTQTbpartial TJAO{OETBT?TcA1()OE{OEET'RIA1IR);OE}O}OORContents of file A2.cs: C#ROOTDTQTbpartial TJAO{OETBT?TcA2()OE{OEET'RIA2IR);OE}O}OOROOA1OA2RCompiled TM of A1.csTVA2.cs: C#ROOTzernal TJAO{ROET{MTgsOERTBT?TcA1()OE{OEET'RIA1IR);OE}OOETBT?TcA2()OE{OEET'RIA2IR);OE}O}R

!]partial class