Do me a favar please!

Question

there is a struct written by c/c++ language: union myunion { G00 g00; G01 g01; G02_G03 g02_g03; G12 g12; ellips g12_g13; g16type g16; G04 g04; G31 g31; G33 g33; G87 g87; G88 g88; S s; } I want to write a struct or a class that has the same function in .Net Compact Framework with C#,unfortunately, I made a mistake by using the attribute 'FieldOffset'---.Net Compact Framework doesn't support the attribute 'FieldOffset'.So how can I do? Please do me a favor and give me some useful suggestion.Thank you.