Why doesn't C# allow incremental compilation like Java?

Why doesn't C# allow incremental compilation like Java?

Specifically, in Java I can compile single .java files in isolation.
The resulting individual .class files can be grouped into .jar files.

In C#, there appears to be no analog. I have to compile all my .cs
files into a single .dll.

This has serious drawbacks in terms of compilation. With Eclipse, I
change a file and only that file is re-compiled. With Visual Studio, I
change a file and have to manually re-compile, which may take 10+
seconds for large projects (even if all I did was add a space to a
comment).

Why was this design decision made? And is there any way to speed up
Visual Studio 2005 C# compilation? Are there plans to have background
compilation in future versions of Visual Studio?

Thanks.

.

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