Save to txt file and recover in a combobox

Question

This is what I need to do:

1. Registering a customer on the form.

2. Save the nome of clients that are registered in a txt file on the computer, example:

   • John
   • Marcos
   • Willian

3. Load these names into a comboBox in another form.

Client form code, so far I was able to create the txt file and put the names, I just did not understand how to show in the combobox now.

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 ProjetoFinal
{
    public partial class frmCadastroClientes : Form
    {
        int i = 0;
        int poc;

        public frmCadastroClientes()
        {
            InitializeComponent();
        }

        private void btnGravar_Click(object sender, EventArgs e)
        {
            i++;
            dgvClientes.Rows.Add(i, txtNome.Text, txtEnd.Text, txtCidade.Text, txtEstado.Text, maskFone.Text, txtEmail.Text);


            //Salvar clientes no TXT
        using (StreamWriter writer = new StreamWriter(@"C:\\Users\\willian\\Downloads\\dbClientes.txt", true))
        {
            writer.WriteLine(txtNome.Text);
        }


                /**
                String nome = txtNome.Text;
                frmOrdemServico os = new frmOrdemServico();
                os.MostrarClientes(nome);




                int tamanho = 50;
                string[] nomes = new string[tamanho];


                for(int i = 1; i < 50; i++)
                {

                }
                **/



                txtNome.Text = "";
            txtEnd.Text = "";
            txtCidade.Text = "";
            txtEstado.Text = "";
            maskFone.Text = "";
            txtEmail.Text = "";

            btnEditar.Enabled = true;
            btnExcluir.Enabled = true;
            btnGravar.Enabled = false;
        }

        private void btnLimpar_Click(object sender, EventArgs e)
        {
            txtNome.Text = "";
            txtEnd.Text = "";
            txtCidade.Text = "";
            txtEstado.Text = "";
            maskFone.Text = "";
            txtEmail.Text = "";

            btnGravar.Enabled = true;
        }

        private void dgvClientes_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            poc = dgvClientes.CurrentRow.Index;

            txtNome.Text = dgvClientes[1, poc].Value.ToString();
            txtEnd.Text = dgvClientes[2, poc].Value.ToString();
            txtCidade.Text = dgvClientes[3, poc].Value.ToString();
            txtEstado.Text = dgvClientes[4, poc].Value.ToString();
            maskFone.Text = dgvClientes[5, poc].Value.ToString();
            txtEmail.Text = dgvClientes[6, poc].Value.ToString();


            btnGravar.Enabled = false;

        }

        private void btnEditar_Click(object sender, EventArgs e)
        {
            dgvClientes[1, poc].Value = txtNome.Text;
            dgvClientes[2, poc].Value = txtEnd.Text;
            dgvClientes[3, poc].Value = txtCidade.Text;
            dgvClientes[4, poc].Value = txtEstado.Text;
            dgvClientes[5, poc].Value = maskFone.Text;
            dgvClientes[6, poc].Value = txtEmail.Text;

            MessageBox.Show("Cliente número: " + i + " Alterado!");
        }

        private void btnExcluir_Click(object sender, EventArgs e)
        {
            if (poc < 0)
                MessageBox.Show("Nenhuma linha selecionada ou não há o que excluir!");
            else
                dgvClientes.Rows.RemoveAt(poc);
        }

        private void frmCadastroClientes_Load(object sender, EventArgs e)
        {

        }

        private void btnNovo_Click(object sender, EventArgs e)
        {
            btnGravar.Enabled = true;
            btnExcluir.Enabled = false;
            btnEditar.Enabled = false;

            txtNome.Text = "";
            txtEnd.Text = "";
            txtCidade.Text = "";
            txtEstado.Text = "";
            maskFone.Text = "";
            txtEmail.Text = "";
        }
    }
}

How can I do that?

Answer 1

You can read the file every time you make a change to it and upload your combobox with the data you have in it.

string[] lineOfContents = File.ReadAllLines(@"C:\\Users\\willian\\Downloads\\dbClientes.txt");
foreach (var line in lineOfContents)
{
   string[] nomes = line.Split(',');
   comboBox1.Items.Add(nomes[0]);
}