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C# Language Reference 
/target:library (Create a Code Library) (C# Compiler Options) 

The /target:library option causes the compiler to create a dynamic-link library (DLL) rather than an executable file (EXE).

/target:library

The DLL will be created with the .dll extension.

Unless otherwise specified with the /out option, the output file name takes the name of the first input file.

When specified at the command line, all files up to the next /out or /target:module option are used to create the .dll file.

When building a .dll file, a Main method is not required.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Properties page. For details, see How to: Set Project Properties (C#, J#).

  2. Click the Application property page.

  3. Modify the Output type property.

For information on how to set this compiler option programmatically, see OutputType.

Compile in.cs, creating in.dll:

csc /target:library in.cs
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