C# Definition:

[StructLayout(LayoutKind.Sequential)]
public struct PARTITION_INFORMATION_EX
{
    [MarshalAs(UnmanagedType.U4)]
    public PARTITION_STYLE PartitionStyle;
    public long StartingOffset;
    public long PartitionLength;
    public int PartitionNumber;
    public bool RewritePartition;
    public PARTITION_INFORMATION_UNION DriveLayoutInformaiton;
}

VB Definition:

Structure PARTITION_INFORMATION_EX
   Public TODO
End Structure

User-Defined Field Types:

[StructLayout(LayoutKind.Explicit)]
public struct PARTITION_INFORMATION_UNION
{
    [FieldOffset(0)]
    public PARTITION_INFORMATION_GPT Gpt;
    [FieldOffset(0)]
    public PARTITION_INFORMATION_MBR Mbr;
}

User-Defined Field Types:

PARTITION_STYLE, PARTITION_INFORMATION_GPT, PARTITION_INFORMATION_MBR

Notes:

None.