private void CreateUser_button_Click(object sender, EventArgs e)
        {
            var clientInfo = new Client
            {
                FirstName   = Name_textbox.Text,
                LastName    = Surnname_textbox.Text,
                CellPhone   = Phone_textbox.Text,
                Description = Details_textbox.Text
            };

            ;
            if (!ClientValidator.ValidateFirstOrSecondName(clientInfo.FirstName))
            {
                NameErrorProvider.SetError(Name_textbox, "Name is not correct.");
            }
            if (!ClientValidator.ValidateFirstOrSecondName(clientInfo.LastName))
            {
                SecondNameErrorProvider.SetError(Surnname_textbox, "Second name is not correct.");
            }
            if (!ClientValidator.ValidatePhoneNumber(clientInfo.CellPhone, true))
            {
                PhoneNumberErrorProvider.SetError(Phone_textbox, $"Phone number is not correct.{Environment.NewLine}It should contain 10 digits.");
            }
            if (ClientValidator.IsValidClientInfo(clientInfo))
            {
                ClientHelper.InsertClientInfo(clientInfo);
                ClearForm();
                MessageLabel.Show();
                MessageLabel.Text = "Client info was successfully saved!";
                //Thread.Sleep(2000);//queeck dummy way))) TODO: change!
                //MessageLabel.Text = string.Empty;
            }
        }
 public void TestMethodPhoneNumber(string val, bool result)
 {
     Assert.AreEqual(result, ClientValidator.IsValidClientInfo(new CarServiceApp.Models.Client
     {
         FirstName = "Name",
         LastName  = "Last",
         CellPhone = val
     }));
 }