private void txt_Email_TextChanged(object sender, EventArgs e) { if (!Utilities.IsValidEmail(txt_Email.Text)) { lb_DangerEmail.Show(); toolTip.Show("Email is not in the right format", lb_DangerEmail); return; } else { toolTip.Hide(lb_DangerEmail); lb_DangerEmail.Hide(); } if (_CustomerRepo.DoesEmailExists(txt_Email.Text)) { lb_DangerEmail.Show(); toolTip.Show("Email already exists", lb_DangerEmail); isEmailExisting = true; } else { toolTip.Hide(lb_DangerEmail); lb_DangerEmail.Hide(); isEmailExisting = false; } }