Building Component Libraries by Using the C# Command-Line Compiler : Assembly « Development « ASP.NET Tutorial

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The C# compiler is located at the following path:

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\csc.exe

The Visual Basic command-line compiler is located at the following path:

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\vbc.exe

You can use the csc.exe tool to compile any C# source file like this:

csc /t:library SomeFile.cs


The /t (target) option causes the compiler to create a component library and not a Console or Windows application. 
When you execute this command, a new file named SomeFile.dll is created, which is the compiled assembly.

To compiling a single file, you can compile all the source code files in a folder (and every subfolder) like this:

csc /t:library /recurse:*.cs /out:MyLibrary.dll

The /recurse option causes the compiler to compile the contents of all the subfolders. 
The /out option provides a name for the resulting assembly.