c# write on processsmemory

i am trying to create with c# loader...

trying patch 2 offset 0x08789 , byte 0x02 patch it 0x17
another one 0x08790 , byte 0x09 patch it 0x2a

example

Process[] p = Process.GetProcessesByName("file.bin");
byte[] offset == "0x08790"
};

trying to do this 2 patch write on writeprocessmemory(processgetbyname)

c# code ?