public class Attachment
    {

        #region Properties
        /// <summary>
        /// sets or gets identifier for attachment
        /// </summary>
        public virtual Guid Id { get; set; }
        /// <summary>
        /// sets or gets name for attachment
        /// </summary>
        public virtual string FileName { get; set; }
        /// <summary>
        /// sets or gets type of attachment
        /// </summary>
        public virtual string ContentType { get; set; }
        /// <summary>
        /// sets or gets size of attachment
        /// </summary>
        public virtual long Size { get; set; }
        /// <summary>
        /// sets or gets Extention of attachment
        /// </summary>
        public virtual string Extensions { get; set; }
        /// <summary>
        /// sets or gets Creation Date
        /// </summary>
        public virtual DateTime CreatedOn { get; set; }
        /// <summary>
        /// gets or sets counts of download this file
        /// </summary>
        public virtual long DownloadsCount { get; set; }

        public virtual DateTime ModifiedOn { get; set; }
        #endregion

        #region NavigationProperties
        /// <summary>
        /// sets or gets identifier of attachment's owner
        /// </summary>
        public virtual long OwnerId { get; set; }
        /// <summary>
        /// sets or gets identifier of attachment's owner
        /// </summary>
        public virtual User Owner { get; set; }
        #endregion
    }

var i = 28;
TypedReference tr = __makeref( i );
Type t = __reftype( tr );
Console.WriteLine( t );
int rv = __refvalue( tr, int );
Console.WriteLine( rv );
ArglistTest.DisplayNumbers( __arglist( 1, 2, 3, 5, 6 ) );

public static class ArglistTest
{
    public static void DisplayNumbers( __arglist )
    {
        var ai = new ArgIterator( __arglist );
        while ( ai.GetRemainingCount() > 0 )
        {
            var tr = ai.GetNextArg();
            Console.WriteLine( TypedReference.ToObject( tr ) );
        }
    }
}

ExceptionDispatchInfo

ExceptionDispatchInfo possibleException = null;
try
{
    int.Parse( "a" );
}
catch ( FormatException ex )
{
    possibleException = ExceptionDispatchInfo.Capture( ex );
}
possibleException?.Throw();

Debug.Assert(1 == 0, "عدد 1 برابر با 0 نیست");

Debug.WriteIf( 1 == 1, "display message in output window :D" );

Debug.WriteLine("تست تورفتگی");
Debug.Indent();
Debug.WriteLine("یک واحد افزایش داده شد");
Debug.Unindent();
Debug.WriteLine("یک واحد کاهش داده شد");
Debug.WriteLine("پایان تست");

<Reference Include="NHibernate, Version=2.1.0.4000, Culture=neutral, PublicKeyToken=aa95f207798dfdb4, processorArchitecture=MSIL">

Could not load file or assembly 'NHibernate, Version=2.0.0.4000, Culture=neutral, PublicKeyToken=aa95f207798dfdb4' 

or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. 

(Exception from HRESULT: 0x80131040)

<meta content="text/html; charset=Windows-1256" http-equiv="Content-Type">

using System.IO;
using System.Text;

public static void SaveAs1256(string fileName)
{
 string content = File.ReadAllText(fileName);
 File.WriteAllText(fileName, content, Encoding.GetEncoding("windows-1256"));
}

[OPTIONS]
Compatibility=1.1 or later
Compiled file=test.chm
Contents file=Table of Contents.hhc
Default Window=win1
Default topic=page1.html
Display compile progress=No
Full-text search=Yes
Index file=Index.hhk
Language=0x429 Farsi
Title=راهنمای یک

[WINDOWS]
win1=,"Table of Contents.hhc","Index.hhk","page1.html","page1.html",,,,,0x3420,,0x304e,,,,,,2,,0


[FILES]
page1.html
page2.html

[INFOTYPES]

Default Font=Tahoma,8,178
Language=0x429 Farsi

<script>
let src = 'https://svelte.dev/tutorial/image.gif';
let name = 'Rick Astley';
</script>

<img src={src} alt="{name} dancing">

<script>
  export let siteName = "dotnettips";
</script>

<p>this is a nested component for third tutorial on {siteName}</p>

<script>
  import Nested from "./Nested.svelte";

  export let name;
</script>

<h1>Hello {name}!</h1>

<Nested siteName="dotnettips.info" />

<script>
import Info from './Info.svelte';

const pkg = {
name: 'svelte',
version: 3,
speed: 'blazing',
website: 'https://svelte.dev'
};
</script>

<Info name={pkg.name} version={pkg.version} speed={pkg.speed} website={pkg.website}/>

<script>
export let name;
export let version;
export let speed;
export let website;
</script>

<p>
The <code>{name}</code> package is {speed} fast.
Download version {version} from <a href="https://www.npmjs.com/package/{name}">npm</a>
and <a href={website}>learn more here</a>
</p>

 The svelte  package is  blazing  fast. Download version  3  from  npm  and  learn more here

<Info {...pkg}/>

<script>
  let count = 0;

  function handleClick() {
    count += 1;
  }
</script>

<p>Count : {count}</p>
<button on:click={handleClick}>
  Clicked {count} {count === 1 ? 'time' : 'times'}
</button>

<script>
let count = 0;
let doubled = count * 2;

function handleClick() {
count += 1;
}
</script>

<button on:click={handleClick}>
Clicked {count} {count === 1 ? 'time' : 'times'}
</button>

<p>{count} doubled is {doubled}</p>

$: doubled = count * 2;

$: console.log(`the count is ${count}`);

$: {
  console.log(`the count is ${count}`);
  alert(`I SAID THE COUNT IS ${count}`);
}

$: if (count >= 10) {
     alert(`count is dangerously high!`);
     count = 9;
}

<script>
  let numbers = [1, 2, 3, 4];

  function addNumber() {
    let newNumber = numbers.length + 1;
    numbers.push(newNumber);
  }

  $: sum = numbers.reduce((t, n) => t + n, 0);
</script>

<p>{numbers.join(' + ')} = {sum}</p>

<button on:click={addNumber}>Add a number</button>

  function addNumber() {
    let newNumber = numbers.length + 1;
    numbers.push(newNumber);
    numbers = numbers;
  }

  function addNumber() {
    let newNumber = numbers.length + 1;
    numbers = [...numbers, newNumber];
  }

<script>
  let name = "";
  function updateName(event) {
    name = event.target.value;
  }
</script>

<h4>My Name Is {name}</h4>
<input value={name} on:input={updateName} />

<script>
  let name = "";
</script>

<h4>My Name Is {name}</h4>
<input bind:value={name} />

{#if condition}
    <!-- you html codes ...  -->
{/if}

<script>
let user = { loggedIn: false };

function toggle() {
user.loggedIn = !user.loggedIn;
}
</script>

{#if user.loggedIn}
<button on:click={toggle}>
Log out
</button>
{/if}

{#if !user.loggedIn}
<button on:click={toggle}>
Log in
</button>
{/if}

{#if condition}
    <!-- you html code when condition is true -->
{:else}
    <!-- you html code when condition is false -->
{/if}

{#if user.loggedIn}
<button on:click={toggle}>
Log out
</button>
{:else}
<button on:click={toggle}>
Log in
</button>
{/if}

{#if condition}
    <!-- you html code when condition is true -->
{:else if condition2}
    <!-- you html code when condition2 is true -->
{:else}
    <!-- you html code when condition and condition2 are false -->
{/if}

{#each list as item}
      <!-- you html code per each item in list -->
{/each}

<script>
let cats = [
{ id: 'J---aiyznGQ', name: 'Keyboard Cat' },
{ id: 'z_AbfPXTKms', name: 'Maru' },
{ id: 'OUtn3pvWmpg', name: 'Henri The Existential Cat' }
];
</script>

<h1>The Famous Cats of YouTube</h1>

<ul>
{#each cats as cat}
<li><a target="_blank" href="https://www.youtube.com/watch?v={cat.id}">
{cat.name}
</a></li>
{/each}
</ul>

<ul>
{#each cats as {id,name}}
<li><a target="_blank" href="https://www.youtube.com/watch?v={id}">
{name}
</a></li>
{/each}
</ul>

<ul>
{#each cats as { id, name }, i}
<li><a target="_blank" href="https://www.youtube.com/watch?v={id}">
{i + 1}: {name}
</a></li>
{/each}
</ul>

• استفاده از فایل ISO همانند ویندوز
• استفاده از فایل VMDK آماده
• ایجاد ایمیج از روی فایل DMG

cd "C:\Program Files\Oracle\VirtualBox\"
VBoxManage.exe modifyvm "Your VM Name" --cpuidset 00000001 000106e5 00100800 0098e3fd bfebfbff
VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "iMac11,3"
VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0"
VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple"
VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
VBoxManage setextradata "Your VM Name" "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1