This class creates a class of persons which is read from a text file. You can search the class for specific persons also.

GetPersonFromTextFile.cs

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static readonly string path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "mytext.txt");
        private void Button1_Click(object sender, EventArgs e)
        {
            using (FileStream reader = File.OpenRead(path))
            using (TextFieldParser iParse = new TextFieldParser(reader))
            {
                iParse.Delimiters = new[] { "," };
                do
                {
                    string[] fields = iParse.ReadFields();
                    RegisteredPerson registeredPerson = new RegisteredPerson(fields[0], fields[1], fields[2], fields[3], fields[4], fields[5]);
                    RegisteredPerson.IEnum.Add(registeredPerson);
                }
                while (!iParse.EndOfData);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            RegisteredPerson personFound = RegisteredPerson.FindPerson("Antanas");
            /* Do things with the persons info */
            if (personFound != null)
                MessageBox.Show($"Persons Address is : {personFound.Address}");
            else MessageBox.Show("No person found");
        }
    }
    public class RegisteredPerson
    {
        public static List<RegisteredPerson> IEnum = new List<RegisteredPerson>();
        public RegisteredPerson(string firstName, string lastName, string gender, string email, string address, string dateOfBirth)
        {
            FirstName = firstName;
            LastName = lastName;
            Gender = gender;
            Email = email;
            Address = address;
            DateOfBirth = dateOfBirth;
        }
        public static RegisteredPerson FindPerson(string param)
        {
            using (List<RegisteredPerson>.Enumerator Person = IEnum.GetEnumerator())
            {
                while (Person.MoveNext())
                {
                    if (Person.Current.FirstName.Equals(param))
                    {
                        return Person.Current;
                    }
                }
            }
            return null;
        }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Gender { get; set; }
        public string Email { get; set; }
        public string Address { get; set; }
        public string DateOfBirth { get; set; }
    }