WPF C# Data Save, Update and Delete with 3 layer architecture - Part 2(DAL Class)

In DAL Class Library Project, add a class and name it CustomerInfoGetway.cs
First add two references of DAL & ENTITY. Now use this code.

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using DATA; using ENTITY; namespace DAL { public class CustomerInfoGetway { //Create object of my EntityFramework data model JSMSEntities dataContextObj = new JSMSEntities(); //Saving Customer Information public void SaveCustomerInfo(CustomerInfo _customerInfoObj) { var newCustomerInfo = new tbl_Customer { CustomerName = _customerInfoObj.CustomerName, CustomerAddress = _customerInfoObj.CustomerAddress, CustomerPhone = _customerInfoObj.CustomerPhone, CustomerMobile = _customerInfoObj.CustomerMobile, CustomerFax = _customerInfoObj.CustomerFax, CustomerEmail = _customerInfoObj.CustomerEmail, CustomerNote = _customerInfoObj.CustomerNote, }; dataContextObj.tbl_Customer.Add(newCustomerInfo); dataContextObj.SaveChanges(); } //Call data from database to ListView public List<CustomerInfo> LoadAllCustomerInfo() { dataContextObj = new JSMSEntities(); List<CustomerInfo> customerInfoList = new List<CustomerInfo>(); foreach (var c in (from p in dataContextObj.tbl_Customer select p).Distinct()) { CustomerInfo _customerInfoObj = new CustomerInfo(); _customerInfoObj.Id = c.ID; _customerInfoObj.CustomerName = c.CustomerName; _customerInfoObj.CustomerAddress = c.CustomerAddress; _customerInfoObj.CustomerPhone = c.CustomerPhone; _customerInfoObj.CustomerMobile = c.CustomerMobile; _customerInfoObj.CustomerFax = c.CustomerFax; _customerInfoObj.CustomerEmail = c.CustomerEmail; _customerInfoObj.CustomerNote = c.CustomerNote; customerInfoList.Add(_customerInfoObj); } return customerInfoList; } //Delete Customer Information public void DeleteCustomerInfo(CustomerInfo _customerInfoObj) { tbl_Customer customer = dataContextObj.tbl_Customer.First(c => c.ID == _customerInfoObj.Id); dataContextObj.tbl_Customer.Remove(customer); dataContextObj.SaveChanges(); } //Update Customer Information public void UpdateCustomerInfo(CustomerInfo _customerInfoObj) { var customerinfo = dataContextObj.tbl_Customer.First(c => c.ID == _customerInfoObj.Id); customerinfo.CustomerName = _customerInfoObj.CustomerName; customerinfo.CustomerAddress = _customerInfoObj.CustomerAddress; customerinfo.CustomerPhone = _customerInfoObj.CustomerPhone; customerinfo.CustomerMobile = _customerInfoObj.CustomerMobile; customerinfo.CustomerFax = _customerInfoObj.CustomerFax; customerinfo.CustomerEmail = _customerInfoObj.CustomerEmail; customerinfo.CustomerNote = _customerInfoObj.CustomerNote; dataContextObj.SaveChanges(); } } }