Can a stored procedure get a value from a .selectedrows.cells[i].value ?

CREATE DEFINER=`root`@`localhost` PROCEDURE `entradas_sai`(
IN ID_VEICULO VARCHAR(45), OUT retcode INT)
BEGIN
    DECLARE _rollback BOOL DEFAULT 0;
    DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET _rollback = 1;
    START TRANSACTION;
	UPDATE entradas SET SAI=1 WHERE id_veiculo='"+ Grid1.SelectedRows.Cells[i].Value +"' AND SAI=0;
        //More 2 queries here but those are fine.
    IF '_rollback' THEN
        SET retcode = 0;
        ROLLBACK;
    ELSE
        SET retcode = 1;
        COMMIT;
    END IF;
END

CREATE DEFINER=`root`@`localhost` PROCEDURE `entradas_sai`(
IN ID_VEICULO VARCHAR(45), OUT retcode INT)
BEGIN
    DECLARE _rollback BOOL DEFAULT 0;
    DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET _rollback = 1;
    START TRANSACTION;
	SELECT * FROM entradas WHERE id_veiculo= "@id_veiculo";
	INSERT INTO entradas(datasai, horasai) VALUES(date(now()) ,time(now()));
	UPDATE entradas SET SAI=1 WHERE id_veiculo="@idveiculo" AND SAI=0;
    IF '_rollback' THEN
        SET retcode = 0;
        ROLLBACK;
    ELSE
        SET retcode = 1;
        COMMIT;
    END IF;
END

private void cmdSaida_Click(object sender, EventArgs e)
{

    using (var cn = new MySqlConnection("server=localhost;user id=root;password=12345;persistsecurityinfo=True;database=portaria;allowuservariables=True"))
        {
            cn.Open();
            if (Grid1.SelectedRows.Count > 0)
            {
                MySqlCommand cmd = new MySqlCommand("entradas_sai", cn);
                cmd.CommandText = "entradas_sai";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@retcode", MySqlDbType.Int32);
                cmd.Parameters["@retcode"].Direction = ParameterDirection.Output;
                cmd.Parameters.AddWithValue("@id_veiculo", Grid1.SelectedCells[1].Value);
                cmd.ExecuteNonQuery();
                var res = cmd.Parameters["@retcode"].Value;
            }
            cn.Close();
        }
    Grid1.Refresh();
}

SELECT * FROM `entradas` WHERE id_veiculo= '"+ Grid1.SelectedRows.Cells[i].Value +"';