Fill in Combobox

Question

In a User Registration Form, I have a combo box UF (which loads the data from an sql table), when writing in Combox the system needs to go searching the data and presenting despite those that coincide with the typed. I’m doing it this way:

    private void carregaComboEstadoCivil()
    {
        ProfissionalBLL profissional = new ProfissionalBLL();
        profissional.carregaComboEstadoCivil(cbxEstadoCivil);

        cbxEstadoCivil.KeyPress += new KeyPressEventHandler(cbxEstadoCivil_KeyPress);
    }

Classe Profissional BLL

    public void carregaComboEstadoCivil(ComboBox combo)
    {
        FuncionsDAL carrega = new FuncionsDAL();
        DataTable tabela = carrega.listaEstadoCivil();

        DataRow linha = tabela.NewRow();

        combo.DropDownStyle = ComboBoxStyle.DropDown;
        combo.AutoCompleteMode = AutoCompleteMode.Suggest;
        combo.DataSource = tabela;
        combo.DisplayMember = "Descricao";
        combo.ValueMember = "ID";
        combo.Update();
        linha["ID"] = 0;
        linha["Descricao"] = "Selecione...";
        tabela.Rows.InsertAt(linha, 0);
    }

Event of the Keypress

    private void cbxEstadoCivil_KeyPress(object sender, KeyPressEventArgs e)
    {
        cbxEstadoCivil.DroppedDown = true;

    }

But it’s not working.

The combobox opens allows me to write but not only shows the record that matches what I wrote it shows me all the record.

Answer 1

    //criando palavras sugeridas
    var source = new AutoCompleteStringCollection();
    source.AddRange(new string[]
            {
                "Masculino",
                "Feminino",
                "Outro"
            });
    // criando combo
    var combobox = new ComboBox
    {
        AutoCompleteCustomSource = source,
        AutoCompleteMode =
            AutoCompleteMode.SuggestAppend,
        AutoCompleteSource =
            AutoCompleteSource.CustomSource,
        Location = new Point(20, 20),
        Width = ClientRectangle.Width - 40,
        Visible = true,
        DropDownStyle = ComboBoxStyle.DropDown
    };
    combobox.Items.Add("Masculino");
    combobox.Items.Add("Feminino");
    combobox.Items.Add("Outro");