using System;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace MvcApplication1.Models
{
    public class Task
    {
        public int Id { set; get; }

        [Required]
        public string Name { set; get; }

        [DisplayName("Due Date")]
        public DateTime? DueDate { set; get; }

        [DisplayName("Is Complete")]
        public bool IsComplete { set; get; }

        [StringLength(450)]
        public string Description { set; get; }
    }
}

Install-Package MvcScaffolding

Attempting to resolve dependency 'T4Scaffolding'.
Attempting to resolve dependency 'T4Scaffolding.Core'.
Attempting to resolve dependency 'EntityFramework'.
Successfully installed 'T4Scaffolding.Core 1.0.0'.
Successfully installed 'T4Scaffolding 1.0.8'.
Successfully installed 'MvcScaffolding 1.0.9'.
Successfully added 'T4Scaffolding.Core 1.0.0' to MvcApplication1.
Successfully added 'T4Scaffolding 1.0.8' to MvcApplication1.
Successfully added 'MvcScaffolding 1.0.9' to MvcApplication1.

Scaffold Controller Task

Scaffold Controller -ModelType Task -ControllerName TasksController -DbContextType TasksDbContext

Scaffold Controller -ModelType Task -ControllerName TasksController -DbContextType TasksDbContext -Repository

Scaffold Controller -ModelType Task -ControllerName TasksController -DbContextType TasksDbContext -Repository -Force

public interface ITaskRepository : IDisposable
{
  IQueryable<Task> All { get; }
  IQueryable<Task> AllIncluding(params Expression<Func<Task, object>>[] includeProperties);
  Task Find(int id);
  void InsertOrUpdate(Task task);
  void Delete(int id);
  void Save();
}

 npm i react-router-dom --save

import { BrowserRouter } from "react-router-dom";

//...

ReactDOM.render(
  <BrowserRouter>
    <App />
  </BrowserRouter>,
  document.getElementById("root")
);

import React from "react";

const Customers = () => {
  return <h1>Customers</h1>;
};

export default Customers;

import React from "react";

const Rentals = () => {
  return <h1>Rentals</h1>;
};

export default Rentals;

import React from "react";

const NotFound = () => {
  return <h1>Not Found</h1>;
};

export default NotFound;

import React from "react";

const MovieForm = () => {
  return (
    <div>
      <h1>Movie Form</h1>
      <button className="btn btn-primary">Save</button>
    </div>
  );
};

export default MovieForm;

import "./App.css";

import React from "react";
import { Redirect, Route, Switch } from "react-router-dom";

import Customers from "./components/customers";
import Movies from "./components/movies";
import NotFound from "./components/notFound";
import Rentals from "./components/rentals";

function App() {
  return (
    <main className="container">
      <Switch>
        <Route path="/movies" component={Movies} />
        <Route path="/customers" component={Customers} />
        <Route path="/rentals" component={Rentals} />
        <Route path="/not-found" component={NotFound} />
        <Redirect to="/not-found" />
      </Switch>
    </main>
  );
}

export default App;

<Redirect from="/" to="/movies" />

<Redirect from="/" exact to="/movies" />

import React from "react";
import { Link, NavLink } from "react-router-dom";

const NavBar = () => {
  return (
    <nav className="navbar navbar-expand-lg navbar-light bg-light">
      <Link className="navbar-brand" to="/">
        Home
      </Link>
      <button
        className="navbar-toggler"
        type="button"
        data-toggle="collapse"
        data-target="#navbarNavAltMarkup"
        aria-controls="navbarNavAltMarkup"
        aria-expanded="false"
        aria-label="Toggle navigation"
      >
        <span className="navbar-toggler-icon" />
      </button>
      <div className="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div className="navbar-nav">
          <NavLink className="nav-item nav-link" to="/movies">
            Movies
          </NavLink>
          <NavLink className="nav-item nav-link" to="/customers">
            Customers
          </NavLink>
          <NavLink className="nav-item nav-link" to="/rentals">
            Rentals
          </NavLink>
        </div>
      </div>
    </nav>
  );
};

export default NavBar;

import NavBar from "./components/navBar";
// ...

function App() {
  return (
    <React.Fragment>
      <NavBar />
      <main className="container">
        // ...
      </main>
    </React.Fragment>
  );
}

export default App;

body {
  margin: 0;
  padding: 0 0 0 0;
  font-family: sans-serif;
}

.navbar {
  margin-bottom: 30px;
}

.clickable {
  cursor: pointer;
}

class MoviesTable extends Component {
  columns = [
    { path: "title", label: "Title" },

class MoviesTable extends Component {
  columns = [
    {
      path: "title",
      label: "Title",
      content: movie => <Link to={`/movies/${movie._id}`}>{movie.title}</Link>
    },

import { Link } from "react-router-dom";

<Route path="/movies/:id" component={MovieForm} />

import MovieForm from "./components/movieForm";

import React from "react";

const MovieForm = ({ match, history }) => {
  return (
    <div>
      <h1>Movie Form {match.params.id} </h1>
      <button
        className="btn btn-primary"
        onClick={() => history.push("/movies")}
      >
        Save
      </button>
    </div>
  );
};

export default MovieForm;

class MyService
{
  public int CalculateXYZ()
  {
    // Tons of work to do in here!
    for (int i = 0; i != 10000000; ++i)
      ;
    return 42;
  }
}

class MyService
{
  public async Task<int> CalculateXYZAsync()
  {
    return await Task.Run(() =>
    {
      // Tons of work to do in here!
      for (int i = 0; i != 10000000; ++i)
        ;
      return 42;
    });
  }
}

 private async void MyButton_Click(object sender, EventArgs e)
{
  await Task.Run(() => myService.CalculateXYZ());
}

await Task.Run(() =>
{
   for (int i = 0; i != 10000000; ++i)
     ;
});

public class Reservation
{
        public int ReservationId { get; set; }
        public string ClientName { get; set; }
        public string Location { get; set; }
}

public interface IRepository
{
        IEnumerable<Reservation> Reservations { get; }
        Reservation this[int id] { get; }
        Reservation AddReservation(Reservation reservation);
        Reservation UpdateReservation(Reservation reservation);
        void DeleteReservation(int id);
}

public class MemoryRepository : IRepository
 {
        private Dictionary<int, Reservation> items;
        public MemoryRepository()
        {
            items = new Dictionary<int, Reservation>();
            new List<Reservation> {
                new Reservation { ClientName = "Alice", Location = "Board Room" },
                new Reservation { ClientName = "Bob", Location = "Lecture Hall" },
                new Reservation { ClientName = "Joe", Location = "Meeting Room 1" }
            }.ForEach(r => AddReservation(r));
        }

        public Reservation this[int id] => items.ContainsKey(id) ? items[id] : null;
        public IEnumerable<Reservation> Reservations => items.Values;

        public Reservation AddReservation(Reservation reservation)
        {
            if (reservation.ReservationId == 0)
            {
                int key = items.Count;
                while (items.ContainsKey(key)) { key++; };
                reservation.ReservationId = key;
            }
            items[reservation.ReservationId] = reservation;
            return reservation;
        }

        public void DeleteReservation(int id) => items.Remove(id);
        public Reservation UpdateReservation(Reservation reservation) => AddReservation(reservation);
}

[Route("api/[controller]")]
public class ReservationController : Controller
    {
        private IRepository repository;
        public ReservationController(IRepository repo) => repository = repo;

        [HttpGet]
        public IEnumerable<Reservation> Get() => repository.Reservations;

        [HttpGet("{id}")]
        public Reservation Get(int id) => repository[id];

        [HttpPost]
        public Reservation Post([FromBody] Reservation res) =>
                    repository.AddReservation(new Reservation
                    {
                        ClientName = res.ClientName,
                        Location = res.Location
                    });
        [HttpPut]
        public Reservation Put([FromBody] Reservation res) => repository.UpdateReservation(res);

        [HttpPatch("{id}")]
        public StatusCodeResult Patch(int id, [FromBody] JsonPatchDocument<Reservation> patch)
        {
            Reservation res = Get(id);
            if (res != null)
            {
                patch.ApplyTo(res);
                return Ok();
            }
            return NotFound();
        }

        [HttpDelete("{id}")]
        public void Delete(int id) => repository.DeleteReservation(id);
}

where T:clas
where T:struc
...

public  class MyCollection<T>
        {
            private List<T> collections = new List<T>();
            public void Add(T value)
            {
                collections.Add(value);
            }
        }

MyCollection<int> myintObj = new MyCollection<int>();
            myintObj.Add(12);
            myintObj.Add(33);
             myintObj.Add(33.3);// ERROR z 
 

public  class MyCollection<T> where T:class
        {
            private List<T> collections = new List<T>();
            public void Add(T value)
            {
                collections.Add(value);
            }
        }

 MyCollection<int> myintObj = new MyCollection<int>(); // ERROR , int is value type

 public  class MyCollection<T> where T:class,IDisposable,new()
        {
   //content
}

public void Swap<T>(ref T val1,ref T val2) where T:struct
            {
//content
            }

 public  class MyCollection<T,K> where T:class where K:IDisposable,new()
        {
//content
}

public abstract class Person
{
    public abstract void ShowInfo();
}

public class Teacher : Person
{
    public override void ShowInfo()
    {
        Console.WriteLine("I am a teacher!");
    }
}

public class Student : Person
{
    public override void ShowInfo()
    {
        Console.WriteLine("I am a student!");
    }
}

Person person = new Teacher();
person.ShowInfo();    // Shows 'I am a teacher!'

person = new Student();
person.ShowInfo();    // Shows 'I am a student!'

public class Person
{
    public virtual void ShowInfo()
    {
        Console.WriteLine("I am a person!");
    }
}

public class Teacher : Person
{
    public override void ShowInfo()
    {
        Console.WriteLine("I am a teacher!");
    }
}

public class Student : Person
{
}

Person person = new Teacher();
person.ShowInfo();    // Shows 'I am a teacher!'

person = new Student();
person.ShowInfo();    // Shows 'I am a person!'

public class Person
{
    public void ShowInfo()
    {
        Console.WriteLine("I am Person");
    }
}

public class Teacher : Person
{
    public new void ShowInfo()
    {
        Console.WriteLine("I am Teacher");
    }
}