❔ how do I select a specific text from the file and delete it and it's corresponding contents in C

static void Cancel()
                    {
                        StreamReader customercancel = new StreamReader("customerdetails.txt");
                        while(customercancel.EndOfStream == false)
                        {
                            string line = customercancel.ReadLine();
                            Console.WriteLine(line);
                        }
                        //customercancel.Close();
                        Console.Write("Select the name you want to cancel the appointment");
                        string namecancel = Console.ReadLine();
                        File.ReadLines("customerdetails.txt")
                        .SkipWhile(line => !line.Contains(namecancel))
                        .Skip(1)
                        .TakeWhile(line => !line.Contains(namecancel));

                    }

                    static void Staff()
                    {
                        StreamReader staffavailability = new StreamReader("staff1.txt");

                        for (int i = 0; i < 10; i++)
                        {
                            string line = staffavailability.ReadLine();
                            Console.WriteLine(line);
                        }
                        staffavailability.Close();
                    }

                }