how can count student

Try this:

using System;

using System.Collections.Generic;

class Student

{

public string Name {get; set;}

public int Grade {get; set;}

public Student(string name, int grade)

{

Name = name;

Grade = grade;

}

class Program

{

static void Main()

{

List list = new List();

Console.WriteLine("Enter student data");

while(true)

{

Console.Write("\n Name (or q to end) : ");

string name = Console.ReadLine();

if (name.ToLower() == "q") break;

int grade;

bool isValid;

{

Console.Write(" Grade 0 to 30 : ");

isValid = int.TryParse(Console.ReadLine(), out grade);

}

while(!isValid || grade < 0 || grade > 30);

Student s = new Student(name, grade);

list.Add(s);

}

int count = 0;

foreach(Student s in list)

{

if (s.Grade > 20) count++;

}

Console.WriteLine("\n{0} out of {1} students have marks greater than 20", count, list.Count);

Console.ReadKey();

}

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