Datenbank Fehler

        private void button10_Click(object sender, EventArgs e)
        {
            string insertQuery = "INSERT INTO forgottensouldb.tanks(`ID`,`Discord Name`,`Join Date`,`Character Name1`,`Realm`,`Class and Spec`,`Character Name2`,`Class and Spec2`,`Bench Player`,`Performance`,`Too late`,`Not excused Absence`,`Other notes`)VALUES('" + textBox1.Text + "', '" + textBox2.Text + "', " + textBox3.Text + textBox4.Text + "'," + textBox5.Text + textBox6.Text + "', " + textBox7.Text + textBox8.Text + "'," + textBox9.Text + textBox10.Text + "', " + textBox11.Text + textBox12.Text + "'," + textBox13.Text + "')";
            connection.Open();
            MySqlCommand command = new MySqlCommand(insertQuery, connection);

            try
            {
                if (command.ExecuteNonQuery() == 1)
                {
                    MessageBox.Show("Data Inserted");
                }
                else
                {
                    MessageBox.Show("Data Not Inserted");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            connection.Close();

        }
    }
}

              
            var _connBuilder = new MySqlConnectionStringBuilder()
            {
                Server = "127.0.0.1",
                Database = "dbname",
                UserID = "username",
                Password = "passwort"
            };

using (var conn = new MySqlConnection(_connBuilder.ConnectionString))
            {
                conn.Open();

                using (var cmd = conn.CreateCommand())
                {
                    cmd.CommandText = "INSERT INTO `forgottensouldb.tanks`(`id`, `value1`, `value2`) VALUES (null,  [MENTION=3453695]ValuE1[/MENTION],  [MENTION=3455287]value2[/MENTION])";
                    cmd.Parameters.AddWithValue(  [MENTION=3453695]ValuE1[/MENTION], value1);
                    cmd.Parameters.AddWithValue(  [MENTION=3455287]value2[/MENTION], value2);
                    int rowCount = cmd.ExecuteNonQuery();

                }
                conn.Close();
            }