How to use a MATLAB function as a .dll in C#?

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C#

I have made a .dll from a MATLAB function (.m file).
The function looks like this:
[a (double)] = fname(b (integer array), c (double array), d (double))
Now, I want to call it in C#. What should I do?
First, I added the .dll as reference in the project.
and then by applying "using" keyword I've tried to call it.
But I do not know the next step. How should I pass "b","c","d" to MATLAB
and then get the result, "a"?
Any comment is appreciated.