Tracing Mov [esi], 00000002 of an external process

Question

I can find mov [esi] by tracing what writes to a certain address with an external memory program like Tsearch, but now I'd like to put that into code form. So, how can I find esi with c#? I already have all the classes written to read/write memory and usually I can just look for a pointer however in this case there are none, and trust me, I looked very hard for them.