private void btnUpdateVendor_Click(object sender, EventArgs e) { if (!(String.IsNullOrEmpty(txtVendorName.Text) || String.IsNullOrWhiteSpace(txtVendorName.Text))) { GeneralMethods.UpdateVendor(VID, txtVendorName.Text); MessageBox.Show("Vendor successfully updated!"); this.Close(); } else { MessageBox.Show("Please enter a valid name for the vendor!", "Error"); } }