Калькулятор маски и номера подсети

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 WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
 
private void Form1_Load(object sender, EventArgs e)
{ }
 
private UInt32 ipToInt(String stringValue)
{
UInt32 intValue = 0;
foreach (String stringPart in stringValue.Split('.'))
{
intValue <<= 8;
intValue |= UInt32.Parse(stringPart);
UInt32 pr2 = intValue;
if (pr2 >= 0 && pr2 < 256)
{
    return 0;
}
else
{
MessageBox.Show("Ошибка [0;255]");
}
}
return intValue;
}
 
private String ipToString(UInt32 intValue)
{
return ((intValue >> 24) & 255).ToString() + "." + ((intValue >> 16) & 255).ToString() + "." + 
((intValue >> 8) & 255).ToString() + "." + (intValue & 255).ToString();
}
 
 
private void button1_Click_1(object sender, EventArgs e)
{
try
{
UInt32 ipAddressInt = ipToInt(textBox1.Text.Split('/')[0]);
UInt32 Mask = UInt32.MaxValue << (32 - int.Parse(textBox1.Text.Split('/')[1]));
int pr = Convert.ToInt32(textBox1.Text.Split('/')[1]);
 
if (pr < 33 && pr >= 1)
{
UInt32 Number = ipAddressInt & Mask;
UInt32 Address = Number | ~Mask;
textBox2.Text = ipToString(Mask);
textBox3.Text = ipToString(Number);
textBox4.Text = ipToString(Address);
}
else {
MessageBox.Show("Ошибка маски [1;32]");
}
 
}
catch (FormatException)
{
MessageBox.Show("Введены некорректные данные.");
}
}
 
private void button1_Click(object sender, EventArgs e)
{
}
 
private void textBox1_TextChanged(object sender, EventArgs e)
{
 
}
 
private void label1_Click(object sender, EventArgs e)
{
 
}
 
private void label3_Click(object sender, EventArgs e)
{
 
}
private void label1_TextChanged(object sender, EventArgs e)
{
 
}
 
private void label4_Click(object sender, EventArgs e)
{
 
}
 
private void textBox2_TextChanged(object sender, EventArgs e)
{
 
}
 
private void textBox3_TextChanged(object sender, EventArgs e)
{
}
}
}