Is this code compatible with asp.net 2.0 ?

 Hi, I'm from Argentina.
I'm having some trouble with a control due (I think) to this part of code:
 
if (name.Length > _prefijo.Length &&
name.Substring(0, _prefijo.Length)==_prefijo && (pos = name.IndexOf(":"))>0 &&
name.Substring(pos+1)== "txtRespuesta")


                        {


                             str
= name.Substring(_prefijo.Length, pos-_prefijo.Length);


                             GrabarRespuestaControlDinamico(pagina,
str);


    & ...