private void buttonAdd_Click(object sender, EventArgs e) { if (Validation.ValidateDonor(textBoxName.Text, textBoxBloodGroup.Text, textBoxRh.Text, textBoxMail.Text, textBoxPhone.Text)) { DialogResult dialogResult = MessageBox.Show("Do you want to add new Donor?", "Adding new Donor", MessageBoxButtons.YesNo); if (dialogResult == DialogResult.Yes) { var Donor = new Donor() { Name = textBoxName.Text, BloodGroup = textBoxBloodGroup.Text, RH = textBoxRh.Text, MailAdress = textBoxMail.Text, PhoneNumber = textBoxPhone.Text }; GetDataOps.AddDonor(Donor); frm.dataGridViewDonors.DataSource = GetDataOps.GetAllDonnors(); } else if (dialogResult == DialogResult.No) { } } else { MessageBox.Show("Error! Entries aren't good"); } }