Considering the table layout like this:
CREATE TABLE `city` (
`city_id` smallint(5) unsigned NOT NULL auto_increment,
`city` varchar(50) NOT NULL,
`country_id` smallint(5) unsigned NOT NULL,
`last_update` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (`city_id`),
KEY `idx_fk_country_id` (`country_id`),
CONSTRAINT `fk_city_country` FOREIGN KEY (`country_id`) REFERENCES `country` (`country_id`) ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8
the C# code for inserting looks like this:
public void InsertMySQL(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("insert into city(city, country_id ) select ?city, ?country_id", oConn);
command.Parameters.Add(new MySql.Data.MySqlClient.MySqlParameter("?city", MySql.Data.MySqlClient.MySqlDbType.VarChar, 50));
command.Parameters.Add(new MySql.Data.MySqlClient.MySqlParameter("?country_id", MySql.Data.MySqlClient.MySqlDbType.Int16));
command.Parameters[0].Value = city;
command.Parameters[1].Value = country_id;
command.ExecuteNonQuery();
oConn.Close();
}