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

    class Students
    {
        public static void Main()
        {
            Hashtable aa = new Hashtable();
            aa.Add("1", "Ahmed");
            aa.Add("2", "Marwa");

            Console.WriteLine("Search Values");
            string name = aa["1"].ToString();
            Console.WriteLine(name);

            Console.WriteLine("List of all students");
            foreach (DictionaryEntry entry in aa)
            Console.WriteLine("{0} {1}", entry.Key, entry.Value, entry.Value);

        }
    }

aa.Add("2", "Marwa");

void search_Student()
{

Console.WriteLine("Search Values");

string name = aa["1"].ToString();

Console.WriteLine(name);

}

using System;
using System.Collections.Generic;

    class Student
    {
        static void Main()
        {
            Dictionary<int, string> lst = new Dictionary<int, string>();

            //Programmatically adding students
            for (byte b = 65; b < 91; b++) // 65 through 91 is the capital letters a - z
                lst.Add(lst.Count + 1, ((char)b).ToString());

            //Reading student names from the user
            while (true)
            {
                Console.WriteLine("Please enter a student names:");
                Console.Write("> ");
                string input = Console.ReadLine();
                input = input.Trim();
                if (input == string.Empty)
                    Console.WriteLine("Invlid student name.");
                else if (lst.ContainsValue(input))
                    Console.WriteLine("Student already exists.");
                else
                {
                    lst.Add(lst.Count + 1, input);
                    Console.WriteLine("Student added.");
                }

                Console.WriteLine("Press Enter to add another student, or any key to continue...");
                Console.WriteLine();
                if (Console.ReadKey(true).Key != ConsoleKey.Enter) break;
            }

            Console.WriteLine(new string('*', 50));

            Console.WriteLine();

            Console.WriteLine("Students:");
            foreach (KeyValuePair<int, string> pair in lst)
                Console.WriteLine("\t{0,2} - {1}", pair.Key, pair.Value);

            Console.WriteLine();

            Console.WriteLine(new string('*', 50));

            Console.WriteLine();

            Console.WriteLine("Enter search string:");
            Console.Write("> ");
            string search = Console.ReadLine();
            search = search.Trim();
            if (search == string.Empty)
                Console.WriteLine("Invalid input.");
            bool found = false;
            foreach (KeyValuePair<int, string> pair in lst)
                if (pair.Value.ToLower() == search.ToLower())
                {
                    Console.WriteLine("Found student '{0}' at index {1}", search, pair.Key);
                    found = true;
                    break;
                }
            if (found == false)
                Console.WriteLine("Student not found!");

            Console.WriteLine();


            Console.WriteLine("Press any key to continue . . . ");
            Console.ReadKey(true);
        }
    }

using System;
using System.Collections.Generic;

namespace MyApp
{
    class Student
    {
        static void Main()
        {
            Hashtable hash = new Hashtable();
            hash.Add(hash.Count + 1, "A");
            hash.Add(hash.Count + 1, "B");
            hash.Add(hash.Count + 1, "C");
            hash.Add(hash.Count + 1, "D");
            hash.Add(hash.Count + 1, "E");
            hash.Add(hash.Count + 1, "F");
            hash.Add(hash.Count + 1, "G");


            SeekStudent(hash, "E");
            SeekStudent(hash, "Z");
        }

        static void SeekStudent(Hashtable hash, string searchStr)
        {
           foreach(DictionaryEntry entry in hash)
               if (entry.Value.ToString().ToLower() == searchStr.ToLower())
               {
                   Console.WriteLine("Student '{0}' found at index {1}", searchStr, entry.Key);
                   return;
               }
           Console.WriteLine("Student not found!");
        }
    }

}

using System;
using System.Collections;

class Search
{
    public struct Student
    {
        public int id;
        public string student_name;
        public string module;
        public string year;
        public double mark;
    }

    public void searchMark(int EnterStudentID)
    {
        // if id =1
        // Result is that
    }

    public void searchAllYearsMark(int EnterStudentName)
    {
        //Result will be for ahmed
        // in 2007 study algebra mark is 80
        // in 2008 study algebra2 mark is 90
    }


    foreach (Student in a )
    {
    //Show all students with Details as full report
    // Ahmed .....
    // Ahmed .....
    // Mohammed ...
    }


    public static void main(string[] arg)
    {
        Student A;
        A.id = 1;
        A.student_name = "Ahmed";
        A.module = "Algebra";
        A.year = "2007";
        A.mark = 80;

        Student AA;
        AA.id = 2;
        AA.student_name = "Ahmed";
        AA.module = "Algebra 2";
        AA.year = "2008";
        AA.mark = 90;

        Student B;
        B.id = 3;
        B.student_name = "Mohammed";
        B.module = "Math";
        B.mark = 90;
    }
}