The example to make the dll call work in vb is like this:

sAnswer = oleOldObject.Request(Array("CODEZ", "LARRY", "JONES", "00"))

The interop has described the method this way:

public abstract new System.Object Request ( System.Object sMessages )

It shows up in code as "Request(ref object)"

I've tried to pass an array everry which way but loose in C#:

Array arrInput = null;
arrInput.SetValue("CODEZ", 0);
arrInput.SetValue("LARRY", 1);
arrInput.SetValue("JONES", 2);
arrInput.SetValue("00", 3);

sAnswer = oleOldObject.Request(ref (object)arrInput);

Produces error:

"A ref or out argument must be an lvalue"

OR

string[] arrInput = {"CODEZ", "LARRY", "JONES", "00};

sAnswer = oleOldObject.Request(ref arrInput);

Produces errors:

1) The best overloaded method match for Object1.oleOldObject.Request(ref
object)' has some invalid arguments.
2) Argument '1': cannot convert from 'ref string[]' to 'ref object'