dll help for electronic card c# 2005

[mikelynch]

Ive been trying to program using the dll that is supplied with a USB Relay card.

The source code supplied was in VB 5 or 6 , not that I know that matters, doesnt mean the dll was written in that or that it matters ??

Anyway the error I get is 'the best overloaded method match for OCUSB.classOCUSB.RelayON(ref byte, ref byte) has some invalid arguments

    C# 2005
        classOCUSB myUSB = new classOCUSB();
            
            bool myBool = true;
            byte a = 0;
            byte b = 1;

            myBool = myUSB.RelayOn(0, 1);
            mybool = myUSB.RelayOn(a, b);
            myBool = myUSB.SetPWM(0, 127);

Any ideas what is wrong ?
'-------------------------------------------------------------------
'Function: RelayOn(Address As Byte, Number As Byte) As Boolean
' Turns off a relay specified by Number
' For the unit defined by Address
'Inputs: Number - The number of the Relay to turn on
' 1-8 = Relays 1-8
' 0 = All Relays OFF
'Returns: True = Success
' False = Timed out
'-------------------------------------------------------------------