Hows come using the below code I never see any data in my database?

SqlCeConnection conn = null;

SqlCeTransaction trans = null;

try

{

conn = new SqlCeConnection(@"Data Source=|DataDirectory|\MediaLister.sdf");

conn.Open();

trans = conn.BeginTransaction();

SqlCeCommand insertMedia = conn.CreateCommand();

String insertMediaSql = "INSERT INTO Media(MediaName, MediaType, MediaLength, MediaDescription)";

insertMediaSql = insertMediaSql + String.Format("VALUES ('{0}','{1}','{2}','{3}')","MediaName", "DVD", "MediaLength", "MediaDescription");

// "VALUES (@MediaName, @MediaType, @MediaLength, @MediaDescription)";

insertMedia.Transaction = trans;

insertMedia.CommandText = insertMediaSql;

//insertMedia.Parameters.Clear();

//insertMedia.Parameters.AddWithValue("@MediaName", this.MediaNameTB.Text);

//insertMedia.Parameters.AddWithValue("@MediaType", this.MediaTypeDDL.Text);

//insertMedia.Parameters.AddWithValue("@MediaLength", this.MediaLengthTB.Text);

//insertMedia.Parameters.AddWithValue("@MediaDescription", this.MediaDescTB.Text);

insertMedia.ExecuteNonQuery();

trans.Commit(CommitMode.Immediate);

}

catch (SqlCeException ex)

{

System.Windows.Forms.MessageBox.Show(ex.Message);

}

finally

{

if (conn != null && conn.State == ConnectionState.Open)

{

conn.Close();

}

}