C#: Product With List + Sorting+ Study of IComparable<t>

//PRODUCT CLASS

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

namespace ProductWithListSorting
    {
    class Product:IComparable<Product>
        {
        public int prod_id { set; get; }
        public string prod_name{ set; get; }

        public int CompareTo(Product ob1) //OVERRIDE OF IComparable<Product>
            {
            if (prod_id > ob1.prod_id)
                return 1;
            if (prod_id < ob1.prod_id)
                return -1;
            else
                return 0;
            }
        }

    }




// FORM1.CS

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 ProductWithListSorting
    {
    public partial class Form1 : Form
        {
        List<Product> plist= new List<Product>();

        public Form1()
            {
            InitializeComponent();
            }

        private void Form1_Load(object sender, EventArgs e)
            {



            }

        private void btnAdd_Click(object sender, EventArgs e)
            {
            Product p = new Product();
            p.prod_id = Convert.ToInt32(txtPid.Text);
            p.prod_name = textBox2.Text;
            plist.Add(p);
            listBox1.Items.Add(p.prod_id + " " + p.prod_name);
            }

        private void btnSort_Click(object sender, EventArgs e)
            {
            plist.Sort(); //CALLS CompareTo FUCNTION OF PRODUCT CLASS
            listBox1.Items.Clear();
            foreach (Product x in plist)
            {
            listBox1.Items.Add(x.prod_id + " " + x.prod_name);

                }

            }
        }
    }



//DESIGNER CLASS


namespace ProductWithListSorting
    {
    partial class Form1
        {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
            {
            if (disposing && (components != null))
                {
                components.Dispose();
                }
            base.Dispose(disposing);
            }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
            {
            this.btnAdd = new System.Windows.Forms.Button();
            this.btnSort = new System.Windows.Forms.Button();
            this.txtPid = new System.Windows.Forms.TextBox();
            this.textBox2 = new System.Windows.Forms.TextBox();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.label1 = new System.Windows.Forms.Label();
            this.txtPname = new System.Windows.Forms.Label();
            this.SuspendLayout();
            //
            // btnAdd
            //
            this.btnAdd.Location = new System.Drawing.Point(91, 224);
            this.btnAdd.Name = "btnAdd";
            this.btnAdd.Size = new System.Drawing.Size(75, 23);
            this.btnAdd.TabIndex = 0;
            this.btnAdd.Text = "Add";
            this.btnAdd.UseVisualStyleBackColor = true;
            this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);
            //
            // btnSort
            //
            this.btnSort.Location = new System.Drawing.Point(190, 224);
            this.btnSort.Name = "btnSort";
            this.btnSort.Size = new System.Drawing.Size(75, 23);
            this.btnSort.TabIndex = 1;
            this.btnSort.Text = "Sort";
            this.btnSort.UseVisualStyleBackColor = true;
            this.btnSort.Click += new System.EventHandler(this.btnSort_Click);
            //
            // txtPid
            //
            this.txtPid.Location = new System.Drawing.Point(102, 27);
            this.txtPid.Name = "txtPid";
            this.txtPid.Size = new System.Drawing.Size(186, 20);
            this.txtPid.TabIndex = 3;
            //
            // textBox2
            //
            this.textBox2.Location = new System.Drawing.Point(102, 101);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(186, 20);
            this.textBox2.TabIndex = 4;
            //
            // listBox1
            //
            this.listBox1.FormattingEnabled = true;
            this.listBox1.Location = new System.Drawing.Point(385, 12);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(229, 186);
            this.listBox1.TabIndex = 5;
            //
            // label1
            //
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(29, 33);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(58, 13);
            this.label1.TabIndex = 6;
            this.label1.Text = "Product ID";
            //
            // txtPname
            //
            this.txtPname.AutoSize = true;
            this.txtPname.Location = new System.Drawing.Point(12, 104);
            this.txtPname.Name = "txtPname";
            this.txtPname.Size = new System.Drawing.Size(75, 13);
            this.txtPname.TabIndex = 7;
            this.txtPname.Text = "Product Name";
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(626, 313);
            this.Controls.Add(this.txtPname);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.listBox1);
            this.Controls.Add(this.textBox2);
            this.Controls.Add(this.txtPid);
            this.Controls.Add(this.btnSort);
            this.Controls.Add(this.btnAdd);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

            }

        #endregion

        private System.Windows.Forms.Button btnAdd;
        private System.Windows.Forms.Button btnSort;
        private System.Windows.Forms.TextBox txtPid;
        private System.Windows.Forms.TextBox textBox2;
        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label txtPname;
        }
    }