private void signUpButton_Click(object sender, EventArgs e) { if (nameTxtBox.Text == "" || idTxtBox.Text == "" || addressTxtBox.Text == "" || phoneTxtBox.Text == "") { MessageBox.Show("please fill mandatory fields"); } else { try { // strSQL = " INSERT INTO tblCustomer (CustomerId, FullName, Address, PhoneNum, Email) VALUES ("+Int32.Parse(idTxtBox.Text)+","+"'"+nameTxtBox.Text+"'"+","+"'"+ addressTxtBox.Text+"'"+"," +Int32.Parse(phoneTxtBox.Text)+"," +"'"+emailTxtBox.Text+"'"+")"; //ClientDA sqlCmd = new ClientDA(strSQL); Client objectClient = new Client(idTxtBox.Text, nameTxtBox.Text, addressTxtBox.Text, Int32.Parse(phoneTxtBox.Text), emailTxtBox.Text); ClientDA.insertEntity(objectClient); MessageBox.Show("Registration is successfull"); this.Hide(); Card card = new Card(objectClient); card.ShowDialog(); Clear(); } catch (Exception) { MessageBox.Show("Please make sure you entered an appropirate values"); } } }