Passing an array to StructureToPtr

[Charming12]

Hi All,
Got stuck with a problem for which i am unable to think of workaround.

I got an structure which contains an array of another structure.

i.e,

structure abc
{
public int code;
}

structure xyz
{
public abc[] structobj;
}

xyz obj = new xyz();
obj.structobj[0].code = 2;

while using StructureToPtr

int size = Marshal.SizeOf(obj);
IntPtr data = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(obj, data, true);

at this step it is showing an error as Incorrect parameters.
However if i am not using an array of structure it is working fine.

Please suggest what should be done.

Thanks
Eric Haas