Не могу понять, как мне вызвать метод TwiceUsedWord() в WordsGen()... - C#

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;
using System.IO;
 
namespace WordsGenerator
{
    public partial class Form1 : Form
    {
        Random rGen;
        string fileName = null;
        bool progIsModified;
        string[] chars = {
           "z", "b", "v", "g", "dz", "dzh", "Г°", "s", "p", "f", "k", "t", "ts", "tsh", "Оё", "x", "m", "n", "r", "l", "w", "j",
           "a", "i", "u", "Й”", "o", "Й›", "e"};
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender,EventArgs e)
        {
            openFileDialog1.FileName = "";
            openFileDialog1.Filter =
                 "Текстовые файлы (*.txt)|*.txt|All files (*.*)|*.*";
        }
        private void WordsGen()
        {
            rGen = new Random();
            var vowelTurn = true;
            int p = 0, syllabNum = 0, charsNum = 0;
            string wordStr = null;
 
            syllabNum = rGen.Next(0,2);//0 - 2слога;1 - 3слога и т.д.
            if (syllabNum == 0) charsNum = 3;
            if (syllabNum == 1) charsNum = 5;
            for (int i = 0; i < charsNum; i++)
            {
                if (vowelTurn)
                {
                    p = rGen.Next(22,chars.Length);
                    wordStr += chars[p];
                    vowelTurn = !vowelTurn;
                }
                else if (!vowelTurn)
                {
                    p = rGen.Next(0,22);
                    wordStr += chars[p];
                    vowelTurn = !vowelTurn;
                }
            }
            TwiceUsedWord();
            textBox2.Text += textBox1.Text + " " + wordStr + Environment.NewLine;
            textBox1.Clear();
        }
 
        private void выбратьСловарьToolStripMenuItem_Click(object sender,EventArgs e)
        {
            openFileDialog1.ShowDialog();
            if (openFileDialog1.FileName == null) return;
            fileName = openFileDialog1.FileName;
            label1.Text = "Выб. словарь " + fileName;
        }
 
        private void открытьToolStripMenuItem_Click(object sender,EventArgs e)
        {
            System.Diagnostics.Process.Start(
                "Wordpad",fileName);
        }
 
        private void сохранитьToolStripMenuItem_Click(object sender,EventArgs e)
        {
            try
            {
                var writer = new StreamWriter(
                    fileName,true,Encoding.UTF8);
                writer.Write(textBox2.Text);
                writer.Close();
                textBox2.Clear();
                progIsModified = false;
            }
            catch (Exception badCase)
            {
                MessageBox.Show(badCase.Message,"Ошибка",
                    MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
            }
        }
 
        private void textBox1_KeyDown(object sender,KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter) WordsGen();
            if (textBox1.Text != null) progIsModified = true;
        }
        private void TwiceUsedWord(KeyEventArgs e)
        {
            var reader = new StreamReader(
                fileName,Encoding.UTF8);
            while (!reader.EndOfStream)
            {
                string line = reader.ReadLine();
                if (line.StartsWith(textBox1.Text) ||
                    textBox2.Text.StartsWith(textBox1.Text))
                {
                    GenerateButton.Enabled = false;
                    e.Handled = true;
                    MessageBox.Show("Данное слово уже существует","Ошибка",
                        MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
                }
            }
        }
 
        private void GenerateButton_Click(object sender,EventArgs e)
        {
            WordsGen();
        }
    }
}