private void btnAdd_Click(object sender, EventArgs e) { if (txtboxConnStr.Text.Length == 0 || txtboxName.Text.Length == 0 || txtboxSurname.Text.Length == 0 || txtboxAge.Text.Length == 0 || txtboxLocation.Text.Length == 0) { MessageBox.Show("Please enter requested textboxes", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } else { ServiceReference1.WebService1SoapClient client = new WebService1SoapClient(); client.AddData(txtboxConnStr.Text, txtboxName.Text, txtboxSurname.Text, int.Parse(txtboxAge.Text), txtboxLocation.Text); txtboxName.Text = ""; txtboxSurname.Text = ""; txtboxAge.Text = ""; txtboxLocation.Text = ""; } }