Array of float passed by ref in Visual C#

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I'm currently porting a working VB6 application in Visual c# but I'm having big troubles converting this external function call to a Fortran DLL.

The VB6 version is

Declare Sub CALC Lib "CALC32.DLL" (ByRef V1 As Single, ByRef V2 As Single)

where V1 is declared as

Public V1(1 To 50) As Single

and V2

Public V2(1 To 100) As Single

In C# I declared

[DllImport("CALC32.DLL")]
static extern void CALC(ref float[] V1, ref float[] V2);

CALC(ref InputData, ref OutputData);

where paramters are declared as

private float[] InputData = new float[50];
private float[] OutputData = new float[100];

When the program call the function itexits without any message.

Any suggestion?

Thanks

Cris