ADO.NET Entity Data Model

In this chapter we undersatand, how to use ADO.NET Entity Data Model.

tblemp

We have created the above table in SQL Server and table name is tblEmp. DataBase Name is Employee.

Create a new application in MVC. Give the name of application according to your need.

Right click on Model folder then Add → New Item.

add new item dialog

In the Add New Item dialog, select the Data category.  Now select ADO.NET Entity Data Model template, give the Entity Data Model the name EmployeeDBModel.edmx. Click the add button.

add new item

It will open the Entity Data Model Wizard. Choose the Generate from a database option and click the Next button.

entity data model wizard

In the next step, create the new connection.

entity data model wizard 1

connection properties

Set the following properties
Data source:  .Net Framework data Provider for SQL server
Server name: (local)
Database Name: Employee

entity data model wizard 2

Save entity connection settings in web.config as: EmployeeDBContext in place of EmployeeEntities. You can provide any name in place of EmployeeEntities. Our database name is Employee that’s why default name is came as EmployeeEntities.

entity data model wizard 3

Click the Next button and choose your database object and click the Finish button.

entity data model wizard 4

After completing these steps, the ADO.NET Entity Data Model Designer opens.

entity data model designer

tblemp in employee dbms

Now you can create controller and view easily. Add a new controller and name it as HomeController with the following option as given below.

add controller

HomeController.cs file

using System.Data;
using System.Linq;
using System.Web.Mvc;

namespace MvcAppDemo.Controllers
{
    public class HomeController : Controller
    {
        private EmployeeDBContext db = new EmployeeDBContext();
        //
        // GET: /Home/
        public ActionResult Index()
        {
            return View(db.tblEmp.ToList());
        }
        //
        // GET: /Home/Details/5
        public ActionResult Details(int id = 0)
        {
            tblEmp tblemp = db.tblEmp.Find(id);
            if (tblemp == null)
            {
                return HttpNotFound();
            }
            return View(tblemp);
        }
        //
        // GET: /Home/Create
        public ActionResult Create()
        {
            return View();
        }
        //
        // POST: /Home/Create
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(tblEmp tblemp)
        {
            if (ModelState.IsValid)
            {
                db.tblEmp.Add(tblemp);
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(tblemp);
        }
        //
        // GET: /Home/Edit/5
        public ActionResult Edit(int id = 0)
        {
            tblEmp tblemp = db.tblEmp.Find(id);
            if (tblemp == null)
            {
                return HttpNotFound();
            }
            return View(tblemp);
        }
        //
        // POST: /Home/Edit/5
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Edit(tblEmp tblemp)
        {
            if (ModelState.IsValid)
            {
                db.Entry(tblemp).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(tblemp);
        }
        //
        // GET: /Home/Delete/5
        public ActionResult Delete(int id = 0)
        {
            tblEmp tblemp = db.tblEmp.Find(id);
            if (tblemp == null)
            {
                return HttpNotFound();
            }
            return View(tblemp);
        }
        //
        // POST: /Home/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public ActionResult DeleteConfirmed(int id)
        {
            tblEmp tblemp = db.tblEmp.Find(id);
            db.tblEmp.Remove(tblemp);
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        protected override void Dispose(bool disposing)
        {
            db.Dispose();
            base.Dispose(disposing);
        }
    }
}


It will create , Index.cshtml, Edit.cshtml, Delete.cshtml, Details.cshtml, Create.cshtml files for you.

The overall folder and files structure will be as given below.

mvc app demo

Run the application, you will get the output as given below.

index
▲