private void updateButton_Click(object sender, EventArgs e) { if (String.IsNullOrEmpty(firstNameBox.Text) || String.IsNullOrEmpty(lastNameBox.Text) || String.IsNullOrEmpty(ageBox.Text) || String.IsNullOrEmpty(heightBox.Text) || String.IsNullOrEmpty(weightBox.Text)) { MessageBox.Show("Empty fields", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } else { client = new Client(); client.FirstName = firstNameBox.Text; client.LastName = lastNameBox.Text; client.Age = int.Parse(ageBox.Text); client.Height = float.Parse(heightBox.Text); client.Weight = float.Parse(weightBox.Text); databaseAccess.updateClient(clientId, client); dataGridView.DataSource = GetDataGridView(); } }