using System;

using System.Collections.Generic;

using System.Linq;

public class Student {

    public int Id { get; set; }

    public string Name { get; set; }

    public bool IsPass { get; set; }

    public int Marks { get; set;}

}

​

public class Test {

    public string Name { get; set; }

}

​

​

​

public class Program {

    public static void Main() {

        String[] val = { "apple", "orange", "grape", "pear" };

        String sep = ", ";

        String result;

​

        Console.WriteLine("sep = '{0}'", sep);

        Console.WriteLine("val[] = {{'{0}' '{1}' '{2}' '{3}'}}", val[0], val[1], val[2], val[3]);

        result = String.Join(sep, val, 1, 2);

        Console.WriteLine("String.Join(sep, val, 1, 2) = '{0}'", result);

​

        // This example produces the following results:

        // sep = ', '

        // val[] = {'apple' 'orange' 'grape' 'pear'}

        // String.Join(sep, val, 1, 2) = 'orange, grape'

    }

}

​

​

​

​

​