Resolve error Value of 'X' is not valid for 'SelectedIndex', where X is any Index value

Hello. I asked a question days ago about capturing the value of a cell from a gridview to a Form leg% and sending it to a combobox in the Form primary. I received a satisfactory response and that causes the Form primary to receive the value, however when I try to change the index from combobox to the index I received the error message Value of 'X' is not valid for ' SelectedIndex ', where X is the received value. It is worth mentioning that when starting the application this same combobox cbComputer is filled with data from a DB table, according to code. I would like to know if there is any way to resolve this impasse.

% Fill_code%:

public DataTable GetIdentificador()
    {
        DataTable dataUf = new DataTable();
        bdConn = new MySqlConnection("Persist Security Info=False;server=localhost;database=controle;uid=root;pwd=''");
        try
        {
            bdConn.Open();
            if (bdConn.State == ConnectionState.Open)
            {
                //Se estiver aberta faz a consulta dos dados do BD
                MySqlCommand cmd = new MySqlCommand("SELECT identificador FROM computador WHERE status=0", bdConn);
                dataUf.Load(cmd.ExecuteReader());
                cmd.Dispose();
            }
            bdConn.Close();
            bdConn.Dispose();
        }
        catch (Exception ex)
        {
            MessageBox.Show("Impossível estabelecer conexão.\n" + ex.Message);
        }

        return dataUf;

    }

When I load combobox with the above method values:

public void Form1_Load(object sender, EventArgs e)
    {
        cbComputador.ValueMember = "identificador";
        cbComputador.DisplayMember = "identificador";
        cbComputador.DataSource = GetUF();
    }

Link to the question I asked earlier with the answer here . In this case, I am using the first option given in the answer. If it was not clear enough, please comment that I try to explain it again in more detail.
Thank you for your attention.