private async void AddData() { Author author = new Author(); author.FullName = txtFullName.Text; author.Address = txtAddress.Text; bool x = await _authorRepository.AddNewAuthorAsync(author); if (x) { XtraMessageBox.Show("Add New successfully !", "Success", MessageBoxButtons.OK); LoadDataToGridView(); } else { XtraMessageBox.Show("Add New failed (not null)!", "Fail", MessageBoxButtons.OK); } }