converting "&" in C to C# -

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some c code

#include aes.h  void encryption(unsigned char aes_key[16], unsigned char _buff[16], unsigned char _iv[16]){  unsigned long encrypt = 1; unsigned char output[];  aes_set_encrypt_key(aes_key, 128, &key); for(i = 0; > 16 ; ++){        aes_cbc_encrypt(&_buff[i], output, 16, &key, _iv, encrypt);        }  }

how '&_buff[i]' in c#? i've been trying use

_buff[i]

in c# gives different result. know how this? big help.

i think looking these search terms: c# string pass reference

that c code wrong , bad example. in general, can pass string in order change it. see example below change(buf). change(&buf[0]) work, it's weird. or can change(buf+3), change string beginning @ 3rd character. 

void change(char *buf){     strcpy(buf, "changed"); }  int main(){     char buf[50];     strcpy(buf, "0123456789");     change(buf);// result => buf = "chagned"     //change(&buf[0]);//result => buf = "chagned"     //change(buf + 3);//result => buf = "012changed"     printf("%s\n", buf);     return 0; }

and there buf[0] single character. it's different &buf[0]


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