"System.Indexoutofrangeexception" in my project c#

Question

In my financial software project I am trying to select in the database and have as a result the moves to be accounted for the balance, in my program I can already addlas in the database and all the other functions I wanted to try using the database, however when I try to do this query I get as a result that there is nothing in the index and if I change index goes telling me that there is no next and so it goes, these moves are already shown in a data grid view on the same screen so I know they are even in the database.

At the time I put this function in the same class as my login method, but I have tried it initially on the screen . Cs and in a separate class.

class Login
    {
        private static string usuario;
        private static string saldo;
        private static string id;

        public bool ValidarUsuario(string email, string senha)
        {
            ConexaoBD bd = new ConexaoBD();
            string sql = string.Format("select * from usuarios where email = '{0}' and senha = '{1}'", email, senha);
            DataTable dt = new DataTable();
            dt = bd.ConsultarDados(sql);

            if (dt.Rows.Count > 0)
            {
                usuario = dt.Rows[0]["usuario"].ToString();
                saldo = dt.Rows[0]["saldo"].ToString();
                id = dt.Rows[0]["id"].ToString();
                return true;
            }
            else
            {
                return false;
            }
        }
        public string UsuarioLogado()
        {
            return usuario;
        }
        public string SaldoUsuario()
        {
            return saldo;
        }
        public string idUsuario()
        {
            return id;
        }

From here

        public string Movimentacao(string tipo)
        {
            Login objLogin = new Login();
            string id = objLogin.idUsuario();
            string result;
            ConexaoBD bd = new ConexaoBD();
            string sql = string.Format("select * from movimentacoes where id = '{0}' and tipo = '{1}'", id, tipo);
            DataTable dt = new DataTable();
            dt = bd.ConsultarDados(sql);


            result = dt.Rows[0]["valor"].ToString();
            return result;

        }

hitherto

actually no longer know what to do, I did several searches and saw that it could be something in my connection class that could be closing after the first query, I tried to edit by removing the part of the code that closed the connection at the end of the query method but without success.