Can't Insert Data Into Sql Database

hi
It seems that my code can insert data into memory, but not into the database. What I mean is that after "insert data", I can "read data",
which I just insert. When I check the actual database table, it didn't
get updated.

I am using VS 2005 and table designer. Regarding to this problem, is
it related to any setting of setup of the database? I check the code,
and I have no idea how it occurs.


private static string connectionString = null;
private static SqlConnection connection = null;
private static string commandString = null;
private static SqlCommand command = null;
private static SqlDataReader reader = null;

static void Main(string[] args)
{
connectionString = ConfigurationManager
.ConnectionStrings["appDatabase.Properties.Settings.databaseConnection String"]
.ConnectionString;

connection = new SqlConnection(connectionString);

try
{
// Insert data
commandString = @"INSERT INTO userTable
(userID, permissionLevel, mobile, emailAddress, mailAddress, pager) VALUES(1, 2, '123', 'aa@a.com', 'oz', 'no')";
SqlCommand command = new SqlCommand(commandString, connection);
connection.Open();
command.ExecuteNonQuery();
connection.Close();

// Read data
commandString = @"select * from userTable";
command = new SqlCommand(commandString, connection);
connection.Open();
reader = command.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(reader["permissionLevel"].ToString());
}
connection.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}

regards
figo2476