insert strings using mysql ODBC

CREATE DEFINER=`stefan`@`%` PROCEDURE `City_Insert`(in p_in_city varchar(50), in p_in_country_id int)
BEGIN
	insert into city (city,country_id) values( p_in_city, p_in_country_id);
	select LAST_INSERT_ID();
END$$

C# code:

  public long InsertMySQL_GetLast_SP(string city, int country_id) 
        { 
            MySql.Data.MySqlClient.MySqlConnection oConn = 
                new MySql.Data.MySqlClient.MySqlConnection("Database=sakila;Data Source=192.168.10.4;User id=stefan;Password=pekka"); 
            oConn.Open(); 
 
 
            MySql.Data.MySqlClient.MySqlCommand command = 
                new MySql.Data.MySqlClient.MySqlCommand("City_Insert", oConn); 
            command.CommandType = CommandType.StoredProcedure; 
            command.Parameters.Add(new MySql.Data.MySqlClient.MySqlParameter("?p_in_city", MySql.Data.MySqlClient.MySqlDbType.VarChar, 50)); 
            command.Parameters.Add(new MySql.Data.MySqlClient.MySqlParameter("?p_in_country_id", MySql.Data.MySqlClient.MySqlDbType.Int64)); 
            command.Parameters[0].Value = city; 
            command.Parameters[1].Value = country_id; 
            //command.ExecuteNonQuery(); 
 
            long lNewId = (long)command.ExecuteScalar(); 
 
            oConn.Close(); 
            return lNewId; 
 
        }