Proper Currying in C#

EDIT: As noted in comments, this is partial application rather than currying. I wrote a blog post on my understanding of the difference, which folks may find interesting.

Well, it's not particularly different - but I'd separate out the currying part from the "calling DoSomething" part:

public static Func<TResult> Apply<TResult, TArg> (Func<TArg, TResult> func, TArg arg)
{
    return () => func(arg);
}

public static Func<TResult> Apply<TResult, TArg1, TArg2> (Func<TArg1, TArg2, TResult> func,
                                                          TArg1 arg1, TArg2 arg2)
{
    return () => func(arg1, arg2);
}

// etc

Then:

DoSomething(Apply(foo, 1));

That way you can reuse the currying code in other situations - including cases where you don't want to call the newly-returned delegate immediately. (You might want to curry it more later on, for example.)

The @Jon Skeet answer is right, but write by hand all possibles overload is something insane, so you can use a lib like Curryfy that do this job for you. Curryfy lib particularly exposes Curry, UnCurry and ApplyPartial extension methods, with a lot of overloads.