Nongeneric Collection:ArrayList By:Tanuj Kumar

Collection in .net with proper coding.

Arraylist:

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;

using ClassLibrary3;

using System.Collections;

namespace collectionarraylist

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        ArrayList arr = new ArrayList();

        int i = 0;

        private void button1_Click(object sender, EventArgs e)

        {

            Class1 obj = new Class1();

            obj.Id = int.Parse(textBox1.Text);

            obj.Name = textBox2.Text;

            arr.Add(obj);

            label3.Text = "saved";

        }

        private void button2_Click(object sender, EventArgs e)

        {

            if (arr.Count > 0)

            {

                Class1 obj = new Class1();

                obj = (Class1)arr[0];

                textBox1.Text = (obj.Id).ToString();

                textBox2.Text = (obj.Name);

            }

            else {

                label3.Text = "no record is saved";

            }

        }

        private void button4_Click(object sender, EventArgs e)

        {

            MessageBox.Show (arr.Count.ToString());

        }

        private void button3_Click(object sender, EventArgs e)

        {

            if (arr.Count > 0)

            {

                Class1 obj = new Class1();

                int a = arr.Count;

                obj = (Class1)arr[a-1];

                textBox1.Text = (obj.Id).ToString();

                textBox2.Text = (obj.Name);

            }

            else

            {

                label3.Text = "no record is saved";

            }

        }

        private void textBox1_TextSelect(object sender, EventArgs e)

        {

            label3.Text = "";

       

       

        }

        private void textBox1_TextChanged(object sender, EventArgs e)

        {

            label3.Text = "";

        }

        private void textBox2_TextChanged(object sender, EventArgs e)

        {

            label3.Text = "";

        }

        private void button5_Click(object sender, EventArgs e)

        {

            Class1 obj = new Class1();

            if (arr.Count > 0)

            {

                int a = int.Parse(textBox3.Text);

                if (arr.Count < a)

                {

                    obj = (Class1)arr[a - 1];

                    textBox1.Text = (obj.Id).ToString();

                    textBox2.Text = (obj.Name);

                }

                else { label3 .Text  = "No record is saved"; }

            }

            else { label3.Text = "No record is saved"; }

        }

        private void textBox3_TextChanged(object sender, EventArgs e)

        {

            label3.Text = "";

        }

    }

}

Arraylist searching by id:

This is button click coding:

{

            Class1 obj = new Class1();

            int a = int.Parse(textBox4.Text);

            for (i = 0; i <= arr.Count; i++)

            {

                obj = (Class1)arr[i];

                if (a == obj.Id) {

                    textBox1.Text = obj.Id.ToString();

                    textBox2.Text = obj.Name;

}

Classlibrary3:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ClassLibrary3

{

    public class Class1

    {

        int id;

        public int Id

        {

            get { return id; }

            set { id = value; }

        }

        string name;

        public string Name

        {

            get { return name; }

            set { name = value; }

        }

    }}