<h1>News</h1>
  <div>Welcome to our site!</div>

  <h2>World</h2>

  <h3>Title 1</h3>
  <div>description 1.</div>

  <h2>Science</h2>

  <h3>Title 2</h3>
  <div>description 2.</div>

  var headings = document.querySelectorAll('h2, h3');
  for (var i = 0; i < headings.length; i++) {
    if (headings[i].tagName === 'H2') {
      headings[i].style.color = 'blue';
    }
    else {
      headings[i].style.color = 'green';
    }
  }

<h2 style="color: blue">….</h2>
<h3 style="color: green">….</h3>

  <h2>World</h2>

  ...

  <h2>Science</h2>

 <script>
  var headings = document.querySelectorAll('h2');
  for (var i = 0; i < headings.length; i++) {
    headings[i].style.color = 'blue';
    headings[i].style.fontWeight = 'bold';
  }
 </script>

 headings[i].style['font-weight'] = 'bold';

  var headings = document.querySelectorAll('h2');

  for (var i = 0; i < headings.length; i++) {
    headings[i].style.cssText = 'color: blue; font-weight: bold';
  }

h2 { color: blue; }
h3 { color: green; }

 <link href="styles.css" rel="style sheet">

<style>
  h2 { color: blue; }
  h3 { color: green; }
</style>

var sheet = document.styleSheets[0];
sheet.insertRule('h2 { font-style: italic; }', sheet.cssRules.length - 1);

// hide an element
$element.hide();

// show it again
$element.show();

element.setAttribute('hidden', '');

element.removeAttribute('hidden');

<style>
  .box {
    padding: 10px;
    margin: 5px;
    border: 3px solid;
    display: inline-block;
  }
</style>
<span class="box">a box</span>

 // returns 38
var clientHeight = document.querySelector('.box').clientHeight;

// returns 55
var clientWidth = document.querySelector('.box').clientWidth;

 // returns 44
var offsetHeight = document.querySelector('.box').offsetHeight;

// returns 61
var offsetWidth = document.querySelector('.box').offsetWidth;

var app = angular.module('myApp', []);

app.controller('myController', function ($scope) {
    $scope.name = 'Masoud';
    $scope.family = 'Pakdel';
})

<div ng-app="myApp">
    <div ng-controller="myController">       
        <div>
            {{name}} {{family}}
        </div>
    </div>
</div>

var app = angular.module('myApp', []);

app.controller('myController', function () {
    this.name = 'Masoud';
    this.family = 'Pakdel';
})

<div ng-app="myApp">
    <div ng-controller="myController as myCtrl">       
        <div>
            {{myCtrl.name}} {{myCtrl.family}}
        </div>
    </div>
</div>

app.config(function($routeProvider){
    $routeProvider.when('/first', { 
            templateUrl: 'first.html', 
            controller: 'FirstCtrl', 
            controllerAs:'fc' })
        .when('/second', { 
            templateUrl: 'second.html' , 
            controller: 'ُSecondCtrl', 
            controllerAs:'sc' })
        .otherwise({ 
            redirectTo: '/first' 
       });
});

WSL2 runs a real Linux kernel in Windows 10 and it's managing a virtual machine platform underneath (and not visible to) Hyper-V client tools, then why not just let WSL2 handle containers for us? That's exactly what the Docker Desklop WSL 2 Tech Preview aims to do. 

و به شکل زیر پیاده سازی CheckArgumentIsNull را در ApplicationDbContext انجام دادم:

public interface IUnitOfWork : IDisposable
    {
        DbSet<TEntity> Set<TEntity>() where TEntity : class;

        int SaveChanges(bool acceptAllChangesOnSuccess);
        int SaveChanges();
        Task<int> SaveChangesAsync(bool acceptAllChangesOnSuccess, CancellationToken cancellationToken = new CancellationToken());
        Task<int> SaveChangesAsync(CancellationToken cancellationToken = new CancellationToken());
        void CheckArgumentIsNull(string v);
    }  
 

void CheckArgumentIsNull(string arg)
        {
            if (arg == null)
                throw new ArgumentNullException(nameof(arg));
        }

آیا کاری که کردم درست است؟

For /f "tokens=2-4 delims=/ " %%a in ('date /t') do (set mydate=%%c_%%a_%%b)
For /f "tokens=1-2 delims=/:" %%a in ("%TIME: =0%") do (set mytime=%%a%%b)
dotnet ef --configuration Release --startup-project ../ProjName/ migrations add V%mydate%_%mytime%

        {
            for (int i = 1; i <=500; i++)
            {
                ThreadPool.QueueUserWorkItem(Execute, i + 1);
            }
        }
void Execute(Object obj)
        {
             int thread = (int)obj;
            try
            {
                using (TestEntities ctx = new TestEntities())
                {
                    int i = 1;
                    foreach (var v in ctx.Customers)
                    {
                        Thread.Sleep(i * 1000);
                        i++;
                    }
                }
                listBox1.Items.Add("Thread " + thread.ToString() + " End Success ");
            }
            catch (Exception e)
            {
                listBox1.Items.Add("Thread " + thread.ToString() + " Error :" + e.Message);
            }
        }