Банковский счёт WinForms

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 Bank_Application {
    public partial class Form1 : Form {

        Queue<BankAccount> accounts = new Queue<BankAccount>();

        public Form1() {
            InitializeComponent();
        }

        class BankAccount {

            //Номер лицевого счёта
            string AccNum;
            //Размер процента вклада
            int procent;

            //Конструктор по умолчанию
            public BankAccount() {
                AccNum = "";
                procent = 0;
            }

            //Аксессор для номера счёта
            public string AccNumA {
                get {
                    return AccNum;
                }

                set {
                    AccNum = value;
                }
            }

            //Аксессор для процентов
            public int ProcentA {
                get {
                    return procent;
                }

                set {
                    procent = value;
                }
            }
        }

        private void button1_Click(object sender, EventArgs e) {
            labelAccNum.Visible = true;
            labelProcent.Visible = true;
            textBoxNumInput.Visible = true;
            textBoxProcentInput.Visible = true;
            buttonAdd.Visible = true;
            textBox1.Visible = false;
        }

        private void Form1_Load(object sender, EventArgs e) {
            accounts.Enqueue(new BankAccount() { ProcentA = 13, AccNumA = "4234623" });
            accounts.Enqueue(new BankAccount() { ProcentA = 10, AccNumA = "7862384" });
            accounts.Enqueue(new BankAccount() { ProcentA = 8, AccNumA = "5465487" });
            accounts.Enqueue(new BankAccount() { ProcentA = 14, AccNumA = "6541516" });
            accounts.Enqueue(new BankAccount() { ProcentA = 18, AccNumA = "8794657" });
        }

        private void buttonAdd_Click(object sender, EventArgs e) {
            BankAccount nev = new BankAccount();
            if (textBoxNumInput.TextLength != 0)
                nev.AccNumA = textBoxNumInput.Text;
            if (textBoxProcentInput.TextLength != 0)
                nev.ProcentA = Int32.Parse(textBoxProcentInput.Text);
            accounts.Enqueue(nev);
        }

        private void buttonPrint_Click(object sender, EventArgs e) {
            textBox1.Visible = true;
            List<string> Num = new List<string>();
            List<int> Prc = new List<int>();
            foreach (BankAccount a in accounts) {
                Num.Add(a.AccNumA);
                Prc.Add(a.ProcentA);
            }
            String[] Meta = new string[Num.Count()];
            string data;
            for (int i = 0; i<Num.Count(); i++) {
                data =  $"{Num[i]}, {Convert.ToString(Prc[i])}%";
                Meta[i] = data;
            }
            textBox1.Lines = Meta;
        }

        private void buttonDelete_Click(object sender, EventArgs e) {
            buttonDeleteNum.Visible = true;
            buttonDeleteProcent.Visible = true;
            labelAccNum.Visible = false;
            labelProcent.Visible = false;
            textBoxNumInput.Visible = false;
            textBoxProcentInput.Visible = false;
            buttonAdd.Visible = false;
            buttonDelete2.Visible = true;
            textBox1.Visible = false;
        }

        private void buttonDeleteNum_Click(object sender, EventArgs e) {
            textBoxDeleteNum.Visible = true;
            textBoxDeleteProcent.Visible = false;
            label4DeleteProcent.Visible = false;
            label4DeleteNum.Visible = true;
            textBox1.Visible = false;
        }

        private void buttonDeleteProcent_Click(object sender, EventArgs e) {
            textBoxDeleteNum.Visible = false;
            textBoxDeleteProcent.Visible = true;
            label4DeleteProcent.Visible = true;
            label4DeleteNum.Visible = false;
            textBox1.Visible = false;
        }

        private void textBoxDeleteProcent_TextChanged(object sender, EventArgs e) {

        }

        private void buttonDelete2_Click(object sender, EventArgs e) {
            BankAccount delete = new BankAccount();
            BankAccount now = new BankAccount();

            if (textBoxDeleteNum.TextLength != 0) {
                delete.AccNumA = textBoxDeleteNum.Text;
                for (int i = 0; i < accounts.Count; i++) {
                    now = accounts.Dequeue();
                    if (now.AccNumA != delete.AccNumA) {
                        accounts.Enqueue(now);
                    }
                }
            }

            else {
                delete.ProcentA = Int32.Parse(textBoxDeleteProcent.Text);
                for (int i = 0; i < accounts.Count; i++) {
                    now = accounts.Dequeue();
                    if (now.ProcentA != delete.ProcentA) {
                        accounts.Enqueue(now);
                    }
                }
            }
            MessageBox.Show("Элемент успешно удалён");

        }

        private void button3_Click(object sender, EventArgs e) {
            textBoxDeleteNum.Visible = false;
            label4DeleteNum.Visible = false;
            textBox1.Visible = false;
            textBoxDeleteProcent.Visible = false;
            label4DeleteProcent.Visible = false;
            labelAccNum.Visible = false;
            labelProcent.Visible = false;
            textBoxNumInput.Visible = false;
            textBoxProcentInput.Visible = false;
            buttonAdd.Visible = false;
            buttonDeleteNum.Visible = false;
            buttonDeleteProcent.Visible = false;
            buttonDelete2.Visible = false;

            BankAccount max = new BankAccount();
            max = accounts.Peek();
            foreach (BankAccount p in accounts) {
                if (p.ProcentA > max.ProcentA) {
                    max.ProcentA = p.ProcentA;
                    max.AccNumA = p.AccNumA;
                }
            }

            MessageBox.Show($"Максимальный процент: {max.ProcentA} на счёте {max.AccNumA}");
        }
    }
}