Convert this codes from C++ to C#

[AbdulsalamS]

#include <iostream>
#include <fstream>
#include <string>
#include <conio.h>
#include <windows.h>

using namespace std;

//Structure defining

//For students
struct student
{
string fname;//for student first name
string lname;//for student last name
string Registration;//for Registration No number
string classes;//for class info
}studentData;//Variable of student type

//For teachers
struct teacher
{
string fst_name;//first name of teacher
string lst_name;//last name of teacher
string qualification;//Qualification of teacher
string exp;//Experiance of the person
string pay;//Pay of the Teacher
string subj;//subject whos he/she teach
string lec;//Lecture per Week
string addrs;//Adders of teacher home
string cel_no;//Phone number
string blod_grp;//Bool Group
string serves;//Number of serves in School

}tech[50];//Variable of teacher type

//Main function

int main()
{
int login();
login();

int i=0,j;//for processing usage
char choice;//for getting choice
string find;//for sorting
string srch;

while(1)//outer loop
{
system("cls");//Clear screen

//Level 1-Display process
cout<<"\t\t\t\t\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\";
cout<<"\n\n\t\t\t\t\t COLLEGE DATA MANAGEMENT\n\n";
cout<<"\t\t\t\t\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\";
cout<<"\n\n\t\t\t\t\t\t:MAIN SCREEN:\n\n";
cout<<"\t\t\t\t\t1. Students Information"<<endl;
cout<<"\t\t\t\t\t2. Teacher Information"<<endl;
cout<<"\t\t\t\t\t3. Exit Program"<<endl;
cout<<"\n\n\t\t\t\tEnter your choice: ";
cin>>choice;

system("cls");//Clear screen

switch(choice)//First switch
{

case '1': //Student
{
while(1)//inner loop-1
{
system("cls");//Clear screen
//Level-2 display
cout<<"\t\t\t\tSTUDENTS INFORMATION AND BIO DATA SECTION\n\n\n";
cout<<"\t\t\t\t\t1. Create new entry\n";
cout<<"\t\t\t\t\t2. Find and display entry\n";
cout<<"\t\t\t\t\t3. Jump to main\n";
cout<<"\n\n\t\t\t\tEnter your choice: ";
cin>>choice;

switch (choice)//Second switch

{
case '1'://Insert data
{ ofstream f1("student.txt",ios::app);

for( i=0;choice!='n';i++)
{

if((choice=='y')||(choice=='Y')||(choice=='1'))
{
system("CLS");
cout<<"\t\t\t\t\tNEW ENTRY\n\n";
cout<<"\t\t\t\t\tEnter First name: ";
cin>>studentData.fname;
cout<<"\n\t\t\t\t\tEnter Last name: ";
cin>>studentData.lname;
cout<<"\n\t\t\t\t\tEnter Registration number: ";
cin>>studentData.Registration;
cout<<"\n\t\t\t\t\tEnter class: ";
cin>>studentData.classes;

f1<<studentData.fname<<endl<<studentData.lname<<endl<<studentData.Registration<<endl<<studentData.classes<<endl;
cout<<"\n\n\t\t\t\t\tDo you want to enter data: ";
cout<<"\n\t\t\t\t\tPress Y for Continue and N to Finish: ";
cin>>choice;
}
}
f1.close();
}
continue;//control back to inner loop -1

case '2'://Display data
{ ifstream f2("student.txt");
system("CLS");
cout<<"\n\t\t\t\tDISPLAY STUDENT'S ENTRY\n";
cout<<"\n\t\t\t\t\tEnter First name to be displayed: ";
cin>>find;
cout<<endl;
int notFound = 0;
for( j=0;(j<i)||(!f2.eof());j++)
{

getline(f2,studentData.fname);

if(studentData.fname==find)
{
notFound = 1;
cout<<"\n\t\t\t\t\tFirst Name: "<<studentData.fname<<endl;
cout<<"\n\t\t\t\t\tLast Name: "<<studentData.lname<<endl;

cout<<"\n\t\t\t\t\tRegistration Number: "<<studentData.Registration<<endl;

cout<<"\n\t\t\t\t\tClass: "<<studentData.classes<<endl<<endl;
}

}


if(notFound == 0){

cout<<"\n\t\t\tNo Record Found"<<endl;
}
f2.close();
cout<<"Press any key two times to proceed";
getch();//To hold data on screen
getch();//To hold data on screen

}
continue;//control back to inner loop -1

case '3'://Jump to main
{
break;//inner switch breaking
}
}

break;//inner loop-1 breaking
}
continue;//Control pass to 1st loop
}

case '2'://Teachers biodata
{
while(1)//inner loop-2
{
system("cls");//Clear screen
//Level-2 Display process
cout<<"\t\t\t\tINSTRUCTOR INFORMATION AND BIODATA SECTION\n\n\n";
cout<<"\t\t\t\t\t1. Create new entry\n";
cout<<"\t\t\t\t\t2. Find and display\n";
cout<<"\t\t\t\t\t3. Jump to main\n";
cout<<"\n\n\t\t\t\tEnter your choice: ";
cin>>choice;

switch (choice)//Third switch
{
case '1'://Insert data
{
ofstream t1("teacher.txt",ios::app);

for(i=0;choice!='n'&& choice!='N';i++)
{

if((choice=='y')||(choice=='Y')||(choice=='1'))
{
system("CLS");
cout<<"\t\t\t\t\tEnter First name: ";
cin>>tech.fst_name;
cout<<"\n\t\t\t\t\tEnter Last name:: ";
cin>>tech.lst_name;
cout<<"\n\t\t\t\t\tEnter Qualification: ";
cin>>tech.qualification;
cout<<"\n\t\t\t\t\tEnter Experiance(year): ";
cin>>tech.exp;
cout<<"\n\t\t\t\t\tEnter Year in this college: ";
cin>>tech.serves;
cout<<"\n\t\t\t\t\tEnter Subject: ";
cin>>tech.subj;
cout<<"\n\t\t\t\t\tEnter Lecture(per Week): ";
cin>>tech.lec;
cout<<"\n\t\t\t\t\tEnter Pay: ";
cin>>tech.pay;
cout<<"\n\t\t\t\t\tAddress: ";
cin>>tech.addrs;
cout<<"\n\t\t\t\t\tEnter Phone Number: ";
cin>>tech.cel_no;
cout<<"\n\t\t\t\t\tEnter Blood Group: ";
cin>>tech.blod_grp;

t1<<tech.fst_name<<endl<<tech.lst_name<<endl
<<tech.qualification<<endl<<tech.exp<<endl
<<tech.serves<<endl<<tech.subj<<endl<<tech.lec
<<endl<<tech.pay<<endl<<tech.addrs<<endl<<tech.cel_no<<endl<<tech.blod_grp<<endl;
cout<<"\n\n\t\t\t\t\tDo you want to enter data: ";
cin>>choice;
}//if
}//for loop
//for finding through name
system("cls");

t1.close();
}//case 1

continue;//Control pass to inner loop-2

case '2'://Display data
{
ifstream t2("teacher.txt");
system("CLS");
cout<<"\n\t\t\t\tDISPLAY TEACHER'S ENTRY\n";
cout<<"\n\t\t\t\t\tEnter name to be displayed: ";
cin>>find;

cout<<endl;
int notFound = 0;
for( j=0;((j<i)||(!t2.eof()));j++)
{

getline(t2,tech[j].fst_name);

if(tech[j].fst_name==find)
{
notFound = 1;
cout<<"\n\t\t\t\t\tFirst name: "<<tech[j].fst_name<<endl;
getline(t2,tech[j].lst_name);
cout<<"\n\t\t\t\t\tLast name: "<<tech[j].lst_name<<endl;
getline(t2,tech[j].qualification);
cout<<"\n\t\t\t\t\tQualification: "<<tech[j].qualification<<endl;
getline(t2,tech[j].exp);
cout<<"\n\t\t\t\t\tExperience: "<<tech[j].exp<<endl;

getline(t2,tech[j].serves);
cout<<"\n\t\t\t\t\tYear in this School: "<<tech[j].serves<<endl;

getline(t2,tech[j].subj);
cout<<"\n\t\t\t\t\tSubject: "<<tech[j].subj<<endl;

getline(t2,tech[j].lec);
cout<<"\n\t\t\t\t\tLecture (per Week): "<<tech[j].lec<<endl;
getline(t2,tech[j].pay);
cout<<"\n\t\t\t\t\tPay: "<<tech[j].pay<<endl;

getline(t2,tech[j].addrs);
cout<<"\n\t\t\t\t\tAddress: "<<tech[j].addrs<<endl;

getline(t2,tech[j].cel_no);
cout<<"\n\t\t\t\t\tPhone Number: "<<tech[j].cel_no<<endl;

getline(t2,tech[j].blod_grp);
cout<<"\n\t\t\t\t\tBlood Group: "<<tech[j].blod_grp<<endl;
}//if

}//for loop
t2.close();
if(notFound == 0){

cout<<"\n\t\t\tNo Record Found"<<endl;
}
cout<<"Press any key two times to proceed";
getch();//To hold data on screen
getch();//To hold data on screen
}//case 2

continue;//Control pass to inner loop-2

case '3'://Jump to main
{
break;//inner switch
}//case 3

}//inner switch

break;//inner while
}//inner loop

continue;//control pass to 1st loop
}//outer case 2

case '3':
{
cout<<"\n Brought To You By code-projects.org";
break;//outer case 3
}//outer case 3
}
break;//outer loop
}
}


int login(){
string pass ="";
char ch;
cout<<"\n\n\n\n\n\n\n\n\t\t\t\t\tCOLLEGE DATA MANAGEMENT SYSTEM \n\n";
cout<<"\t\t\t\t\t------------------------------";
cout<<"\n\t\t\t\t\t\t LOGIN \n";
cout<<"\t\t\t\t\t------------------------------\n\n";
cout << "\t\t\t\t\tEnter Password: ";
ch = _getch();
while(ch != 13){//character 13 is enter
pass.push_back(ch);
cout << '*';
ch = _getch();
}
if(pass == "pass"){
cout << "\n\n\n\t\t\t\t\t\tAccess Granted! \n";
system("PAUSE");
system ("CLS");
}else{
cout << "\n\n\t\t\t\t\t\t\t\tAccess Aborted...\n\t\t\t\t\t\t\t\tPlease Try Again\n\n";
system("PAUSE");
system("CLS");
login();
}
}

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