private void btnAccept_Click(object sender, EventArgs e) { if (checkAdd()) { //Assign New CustomerInfo supplierInfo.SupplierID = int.Parse(txtSupplierID.Text); supplierInfo.SupplierName = txtName.Text; supplierInfo.Contact = txtContact.Text; supplierInfo.PhoneNumber = txtPhoneNumber.Text; supplierInfo.Fax = txtFax.Text; supplierInfo.Address = txtAddress.Text; supplierInfo.AreaID = int.Parse(cbbArea.SelectedValue.ToString()); supplierInfo.Position = txtPosition.Text; //Add new Customer supplierBUS.AddNewSupplier(supplierInfo); MessageBox.Show("Create Successful!!!", "Succes", MessageBoxButtons.OK, MessageBoxIcon.Asterisk); this.Close(); } else { if (txtSupplierID.Text == "") { MessageBox.Show("Supplier ID can't be blank!!!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } if (cbbArea.Text == "") { MessageBox.Show("Area can't be blank!!!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } if (txtName.Text == "") { MessageBox.Show("Supplier Name can't be blank!!!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } }