Перевод кода на С#

#include <stdio.h>
#include <stdlib.h>
#include <fstream>
#include <iostream>
struct student{
char fio[20];
char adres[20];
char gruppa[20] ;
int reit;
};
void addtofile(int n)
{
student*mas;
FILE *f;
f=fopen("student.dat","w");
mas=new student[n];
for (int i=0 ;i<n;i++){
printf("Vvedite informaciu na studenta nomer %i",i+1);
printf("\n Fio: ");scanf("%s",&mas[i].fio);
printf(" Adres: ");scanf("%s",&mas[i].adres);
printf(" Gruppu: ");scanf("%s",&mas[i].gruppa);
printf(" Reiting: ");scanf("%i",&mas[i].reit);
}
for (int i=0;i<n;i++){
fwrite(&mas[i],sizeof(student),1,f);
}
fclose(f);
}
 
void print_from_file(int n){
FILE *f;
f=fopen("student.dat","r");
student *mas;
mas=new student[n];
for (int i=0;i<n;i++){
fread(&mas[i],sizeof(student),1,f);
printf("\n Informacia na studenta nomer %i",i+1);
printf("\n Fio: %s",mas[i].fio);
printf("\n Adres: %s",mas[i].adres);
printf("\n Gruppa: %s",mas[i].gruppa);
printf("\n Reiting: %i",mas[i].reit);
}
fclose(f);
}
int delete_from_file(int n ,int k){
FILE *f;
f=fopen("student.dat","r");
FILE*newf;
newf=fopen("buff.dat","w");
student *mas;
mas=new student[n];
int p=0,reiting; 
for (int i=0;i<n;i++){
fread(&mas[i],sizeof(student),1,f);
reiting=mas[i].reit;
if (reiting>k){
fwrite(&mas[i],sizeof(student),1,newf);
p++;    
} 
 
}
fclose(f);  
fclose(newf);
remove("student.dat");
rename("buff.dat","student.dat");
return p ; 
}
 
 
void add_k(int n,int k){
FILE *f;
f=fopen("student.dat","r");
FILE*newf;
newf=fopen("buff.dat","w");
student *mas;
student *mas2;
mas=new student[n];
mas2=new student[1];
for (int i=0;i<n;i++){
fread(&mas[i],sizeof(student),1,f);
if (i==k)   { 
printf(" \nVvedite informaciu na studenta nomer %i",1);
printf("\n Fio: ");scanf("%s",&mas2[0].fio);
printf(" Adres: ");scanf("%s",&mas2[0].adres);
printf(" Gruppa: ");scanf("%s",&mas2[0].gruppa);
printf(" Reiting: ");scanf("%i",&mas2[0].reit);
fwrite(&mas2[0],sizeof(student),1,newf);
}
fwrite(&mas[i],sizeof(student),1,newf);
}
fclose(f);  
fclose(newf);
remove("student.dat");
rename("buff.dat","student.dat");   
}
int main(){
int n;
printf("Vvedite colichestvo studentov: ");
scanf("%i",&n);
addtofile(n);
print_from_file(n);
printf("\n Vvedite reiting: ");
int k,p;
scanf("%i",&k);
p=delete_from_file(n,k);
n=p;
printf("\n Novii file ");
print_from_file(n);
 
printf("\n Vvedite nomer posle kotorogo vvodit' elementi: ");
int aftn;
scanf("%i",&aftn);  
 
add_k(n,aftn);
printf("\n Novii file posle dobavlenija");
n=n+1;
print_from_file(n);
}