How to do this in C# (dynamic resize)

using System;

class App {

   static void Main() {
      // Construct an array of 3 elements
      Int32[] arr = new Int32[] { 1 , 2, 3 };

      // Display all the elements in the array
      foreach (Int32 x in arr) 
         Console.Write(x + " ");
      Console.WriteLine();

      // Redimension the array so that it now contains 5 elements
      arr = (Int32[]) Redim(arr, 5);

      // Display all the elements in the array
      foreach (Int32 x in arr) 
         Console.Write(x + " ");
      Console.WriteLine();

      // Redimension the array so that it now contains 2 elements
      arr = (Int32[]) Redim(arr, 2);

      // Display all the elements in the array
      foreach (Int32 x in arr) 
         Console.Write(x + " ");
   }

   public static Array Redim(Array origArray, Int32 desiredSize) {

      // Determine the types of each element
      Type t = origArray.GetType().GetElementType();

      // Construct a new array with the desired number of elements
      // Each element is the same type as was in the original array
      Array newArray = Array.CreateInstance(t, desiredSize);

      // Copy the element from the original array in to the new array
      Array.Copy(origArray, 0, 
         newArray, 0, Math.Min(origArray.Length, desiredSize));

      // Return the new array
      return newArray;
   }
}

I would take a look at using a typed list; you can create a list (List) where 'T' is the type of object you plan to store in the list and then you can dynamically add objects to the list and retrieve them or iterate through the list; here is an example, in it there is a class called Employee that holds employee information; when the application runs, a List is created, three employees are then created and added to the list, next the code iterates through the list to report on all of the employees, and last, using LINQ to Objects, the code finds a single employee (#2) and reports that employee's first and last name:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace Junk

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            List<Employee> employees = new List<Employee>();

            Employee e1 = new Employee();

            e1.FirstName = "Harry";

            e1.MiddleName = "Wilson";

            e1.LastName = "Anderson";

            e1.EmployeeNumber = 1;

            employees.Add(e1);

            Employee e2 = new Employee();

            e2.FirstName = "Wallace";

            e2.MiddleName = "Authur";

            e2.LastName = "Slawson";

            e2.EmployeeNumber = 2;

            employees.Add(e2);

            Employee e3 = new Employee();

            e3.FirstName = "Debra";

            e3.MiddleName = "Michelle";

            e3.LastName = "Carmichael";

            e3.EmployeeNumber = 3;

            employees.Add(e3);

            // iterate

            foreach (Employee e in employees)

            {

                StringBuilder sb = new StringBuilder();

                sb.Append(e.FirstName + " " + e.MiddleName + " "

                + e.LastName + Environment.NewLine);

                sb.Append("Employee Number: " + e.EmployeeNumber.ToString());

                MessageBox.Show(sb.ToString(), "Employee Number " +

                e.EmployeeNumber);

            }

            // search (using Linq to Objects)

            var q =

                (from e in employees

                where e.EmployeeNumber == 2

                select e).SingleOrDefault<Employee>();

            MessageBox.Show(q.EmployeeNumber + " " + q.FirstName + " " +

            q.LastName, "Search");

        }

    }

    public class Employee

    {

        public string FirstName;

        public string MiddleName;

        public string LastName;

        public int EmployeeNumber;

    }

}