C# Metin Dosyalarını Sırayla Okutmak

string fileName = @"C:\Users\Public\Documents\KullanıcıAdları.txt";
string writeText = textBox3.Text;
FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write);
fs.Close();

string[] lines = File.ReadAllLines(@"C:\Users\Public\Documents\KullanıcıAdları.txt");
if (lines.Length > 0)
textBox3.Text = lines[0];
string A = ("https://www.instagram.com/");
driver.Navigate().GoToUrl(string.Concat(A, lines[1]));
System.Threading.Thread.Sleep(3000);
driver.Navigate().GoToUrl(string.Concat(A, lines[2]));
System.Threading.Thread.Sleep(3000);
File.Delete(@"C:\Users\Public\Documents\KullanıcıAdları.txt");
driver.Close();

           string[] lines = File.ReadAllLines(@"C:\Users\Public\Documents\KullanıcıAdları.txt");
            string A = ("https://www.instagram.com/");
            try
            {
                _ = (lines[1] == "");
            }
            catch (System.IndexOutOfRangeException)
            {
                switch (MessageBox.Show("Kullanıcı Adı Girilmedi Veya Herkez Takip Edildi Program Kapatılıyor.", "Bilgilendirme", MessageBoxButtons.OK, MessageBoxIcon.Error))
                {
                    case DialogResult.OK:
                        this.Close();
                        File.Delete(@"C:\Users\Public\Documents\KullanıcıAdları.txt");
                        break;
                }
                driver.Close();

            }
            driver.Navigate().GoToUrl(string.Concat(A, lines[1]));
            try
            {
                driver.FindElement(By.XPath("/html/body/span/section/main/div/header/section/div[1]/div[1]/span/span[1]/button")).Click();
                System.Threading.Thread.Sleep(2000);

            }
            catch (OpenQA.Selenium.NoSuchElementException)
            {
                driver.FindElement(By.XPath("/html/body/span/section/main/div/header/section/div[1]/button")).Click();
                System.Threading.Thread.Sleep(2000);
            }
            finally
            {
                driver.Navigate().GoToUrl(string.Concat(A));
            }