Вывод информации из базы данных в dataGrid

string connectionString = @"Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=test;Integrated Security=True";
            string sql = "SELECT * FROM [Phonebook]";
            usersTable = new DataTable();
            connection = new SqlConnection();
            try
            {
                connection = new SqlConnection(connectionString);
                SqlCommand command = new SqlCommand(sql, connection);
                adapter = new SqlDataAdapter(command);
                adapter.InsertCommand = new SqlCommand("sp_Phonebooknew");
                adapter.InsertCommand.CommandType = CommandType.StoredProcedure;
                adapter.InsertCommand.Parameters.Add(new SqlParameter("@Name", SqlDbType.NVarChar, 50, "Name"));
                adapter.InsertCommand.Parameters.Add(new SqlParameter("@Dnumber", SqlDbType.NVarChar, 50, "Dnumber"));
                adapter.InsertCommand.Parameters.Add(new SqlParameter("@Tnumber", SqlDbType.NVarChar, 50, "Tnumber"));
                adapter.InsertCommand.Parameters.Add(new SqlParameter("@Otnow", SqlDbType.NVarChar, 50, "Otnow"));
                SqlParameter parameter = adapter.InsertCommand.Parameters.Add("@Id", SqlDbType.Int, 0, "Id");
                parameter.Direction = ParameterDirection.Output;
 
                connection.Open();
                adapter.Fill(usersTable);
                dataGrid.ItemsSource = usersTable.DefaultView;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                if (connection != null)
                    connection.Close();
            }

adapter.InsertCommand = new SqlCommand("sp_Phonebooknew");
                adapter.InsertCommand.CommandType = CommandType.StoredProcedure;

adapter.InsertCommand.CommandType = CommandType.StoredProcedure;

catch (Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }

string connectionString = @"Data Source=C:\Users\it\test.db";
            string sql = "SELECT * FROM [Phonebook]";
            usersTable = new DataTable();
            sqlconnection = new SQLiteConnection();
            try
            {
                sqlconnection = new SQLiteConnection(connectionString);
                SQLiteCommand command = new SQLiteCommand(sql, sqlconnection);
                sqladapter = new SQLiteDataAdapter(command);
                SQLiteCommandBuilder cb= new SQLiteCommandBuilder(sqladapter);
                sqladapter.InsertCommand = cb.GetInsertCommand();
                sqladapter.UpdateCommand = cb.GetUpdateCommand();
                sqladapter.DeleteCommand = cb.GetDeleteCommand();              
                sqlconnection.Open();
                sqladapter.Fill(usersTable);
                dataGrid.ItemsSource = usersTable.DefaultView;
            }
            catch(Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }
            finally
            {
                if (sqlconnection != null)
                    sqlconnection.Close();
            }