using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace LinqDemo
{
    class Program
    {
      
        /// <summary>
        /// This method display string array records either in ascending order
        /// or descending order on basis of order parameter. For performing
        /// this task I have use LINQ. We use orderby clause to specify ordering
        /// followed by variable name then order which is either ascending or
        /// descending. If you do not specify order then linq generate list
        /// in ascending order.
        /// </summary>
        public void displayValueInOrder(string[] records, string order)
        {
            if (order.Equals("ASC"))
            {
                var record = from std in records
                       orderby std ascending
                       select std;

                //Displaying record in ascending order.
                foreach (string data in record)
                    Console.WriteLine(data);
            }
            else
            {
                var record = from std in records
                       orderby std descending
                       select std;

                //Displaying record in descending order.
                foreach (string data in record)
                    Console.WriteLine(data);
            }
        }

        /// <summary>
        /// This method search record from array and display first search value.
        /// searchSingleRecord() method takes two parameter first records array
        /// in which search operation needs to be perform and second one is
        /// search value which needs to be searched. After searching record
        /// it display first value if exists from search record.
        /// </summary>
        public void searchSingleRecord(string[] records,string searchValue)
        {
            string record = (from std in records
                             where std.Equals(searchValue)
                             select std).FirstOrDefault();

            Console.WriteLine(record);
        }

        static void Main(string[] args)
        {
            string[] studentName = { "Awadhendra", "Ankit", "James", "John", "Cat", "Shilpa", "Shivam", "Haider", "Ashish" };

            Program pr = new Program();
            pr.displayValueInOrder(studentName, "ASC");

            Console.WriteLine();
            pr.searchSingleRecord(studentName, "Avanish");

            Console.ReadKey();
           
        }
    }
}

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