Как определить, что 4-ый октет первого IP адреса меньше второго октета второго IP адреса?

[atm87]

Есть 2 файла Form2.cs:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace MyPCProject
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
 
        private void Form2_Load(object sender, EventArgs e)
        {
 
        }
 
        private void ipAddressControl1_KeyDown(object sender, KeyEventArgs e)
        {
            Console.WriteLine("KeyDown: {0}", e.KeyValue);
        }
 
        private void ipAddressControl1_KeyPress(object sender, KeyPressEventArgs e)
        {
            Console.WriteLine("KeyPress: {0}", Convert.ToInt32(e.KeyChar));
        }
 
        private void ipAddressControl1_KeyUp(object sender, KeyEventArgs e)
        {
            Console.WriteLine("KeyUp: {0}", e.KeyValue);
        }
 
        private void ipAddressControl1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
        {
            Console.WriteLine("PreviewKeyDown: {0}", e.KeyValue);
        }
 
        private void groupBox1_Enter(object sender, EventArgs e)
        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
 
        }
    }
}

и второй файл Form2.Designer.cs:

namespace MyPCProject
{
    partial class Form2
    {
        /// <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.groupBox1 = new System.Windows.Forms.GroupBox();
            this.ipAddressControl2 = new IPAddressControlLib.IPAddressControl();
            this.ipAddressControl1 = new IPAddressControlLib.IPAddressControl();
            this.button1 = new System.Windows.Forms.Button();
            this.groupBox1.SuspendLayout();
            this.SuspendLayout();
            //
            // groupBox1
            //
            this.groupBox1.Controls.Add(this.button1);
            this.groupBox1.Controls.Add(this.ipAddressControl2);
            this.groupBox1.Controls.Add(this.ipAddressControl1);
            this.groupBox1.Location = new System.Drawing.Point(12, 5);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(152, 109);
            this.groupBox1.TabIndex = 0;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "Из диапазона IP-адресов";
            this.groupBox1.Enter += new System.EventHandler(this.groupBox1_Enter);
            //
            // ipAddressControl2
            //
            this.ipAddressControl2.AllowInternalTab = false;
            this.ipAddressControl2.AutoHeight = true;
            this.ipAddressControl2.BackColor = System.Drawing.SystemColors.Window;
            this.ipAddressControl2.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.ipAddressControl2.Cursor = System.Windows.Forms.Cursors.IBeam;
            this.ipAddressControl2.Location = new System.Drawing.Point(6, 50);
            this.ipAddressControl2.MinimumSize = new System.Drawing.Size(87, 20);
            this.ipAddressControl2.Name = "ipAddressControl2";
            this.ipAddressControl2.ReadOnly = false;
            this.ipAddressControl2.Size = new System.Drawing.Size(140, 20);
            this.ipAddressControl2.TabIndex = 2;
            this.ipAddressControl2.Text = "...";
            this.ipAddressControl2.KeyDown += new System.Windows.Forms.KeyEventHandler(this.ipAddressControl1_KeyDown);
            this.ipAddressControl2.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.ipAddressControl1_KeyPress);
            this.ipAddressControl2.KeyUp += new System.Windows.Forms.KeyEventHandler(this.ipAddressControl1_KeyUp);
            this.ipAddressControl2.PreviewKeyDown += new System.Windows.Forms.PreviewKeyDownEventHandler(this.ipAddressControl1_PreviewKeyDown);
            //
            // ipAddressControl1
            //
            this.ipAddressControl1.AllowInternalTab = false;
            this.ipAddressControl1.AutoHeight = true;
            this.ipAddressControl1.BackColor = System.Drawing.SystemColors.Window;
            this.ipAddressControl1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
            this.ipAddressControl1.Cursor = System.Windows.Forms.Cursors.IBeam;
            this.ipAddressControl1.Location = new System.Drawing.Point(6, 20);
            this.ipAddressControl1.MinimumSize = new System.Drawing.Size(87, 20);
            this.ipAddressControl1.Name = "ipAddressControl1";
            this.ipAddressControl1.ReadOnly = false;
            this.ipAddressControl1.Size = new System.Drawing.Size(140, 20);
            this.ipAddressControl1.TabIndex = 1;
            this.ipAddressControl1.Text = "...";
            this.ipAddressControl1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.ipAddressControl1_KeyDown);
            this.ipAddressControl1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.ipAddressControl1_KeyPress);
            this.ipAddressControl1.KeyUp += new System.Windows.Forms.KeyEventHandler(this.ipAddressControl1_KeyUp);
            this.ipAddressControl1.PreviewKeyDown += new System.Windows.Forms.PreviewKeyDownEventHandler(this.ipAddressControl1_PreviewKeyDown);
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(24, 76);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(106, 23);
            this.button1.TabIndex = 3;
            this.button1.Text = "Собрать данные";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // Form2
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(176, 450);
            this.Controls.Add(this.groupBox1);
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "Form2";
            this.Text = "Сбор данных";
            this.Load += new System.EventHandler(this.Form2_Load);
            this.groupBox1.ResumeLayout(false);
            this.ResumeLayout(false);
 
        }
 
        #endregion
        private IPAddressControlLib.IPAddressControl ipAddressControl1;
        private IPAddressControlLib.IPAddressControl ipAddressControl2;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.Button button1;
    }
}

Вот так выглядит форма:

Вопрос:
Нужны следующие проверки
1. Первые 3 октета IP адресов из обоих полей должны быть одинаковые.
2. 4-ый октет первого IP-адреса должен быть меньше 4-го октета второго IP-адреса.

Помогите пожалуйста, что мне прописать в коде?