convert to c# from java buffered reader

import java.io$.*$;

import java.text.DecimalFormat; $//$ for decimal formatting

public class ClassAverageBR

$\{$

public static void main$($String$[]$ args$)$ throws IOException

$\{$

$//$declare and initialize variables

int score;

int sumOfScoresByStudent $=0$;

int sumOfAllScores $=0$;

double classAverage;

BufferedReader dataIn $=$ new BufferedReader$($new InputStreamReader$($System$.$in$))$;

String studentName;

String scoreStr;

String studentNameMessage $=$ "Enter the name of the student:";

String numOfStudentStr $=$ "Enter the number of students: $"$;

String numOfScoresStr $=$ "Enter the number of scores to be entered per student: $"$;

String outputTable $=$ "Names, scores, average scores, and letter grades:

$"$;

DecimalFormat fmtDecimal $=$ new DecimalFormat$("$###$.$##$")$;

$//$get input from user

System.out.println$($numOfStudentStr$)$;

int numOfStudents $=$ Integer.parseInt$($dataIn$.$readLine$())$;

System.out.println$($numOfScoresStr$)$;

int numOfScores $=$ Integer.parseInt$($dataIn$.$readLine$())$;

$//$declare arrays

int$[][]$ scores $=$ new int$[$numOfStudents$][$numOfScores$]$;

String$[]$ students $=$ new String$[$numOfStudents$]$;

double$[]$ avgScores $=$ new double$[$numOfStudents$]$;

char$[]$ letterGrades $=$ new char$[$numOfStudents$]$;

$//$get more user input, load arrays, and process data

for $($int i $=0$; i$=90)$

theGrade $=\text{'}$A$\text{'}$;

else if $($averageScore $>=80)$

theGrade $=\text{'}$B$\text{'}$;

else if $($averageScore $>=70)$

theGrade $=\text{'}$C$\text{'}$;

else if $($averageScore $>=60)$

theGrade $=\text{'}$D$\text{'}$;

else

theGrade $=\text{'}$F$\text{'}$;

return theGrade;

$\}//$ end findGrade

$\}//$ end class