A super simple wizard for getting the right CSS to center elements in various ways, whether horizontally, vertically, or both. 

<form asp-controller="Account" 
      asp-action="Login">
//Your form elements here
</form>

@using (Html.BeginForm("ControllerName", "ActionName"))
{
   //Form Contents Here
}

for (element of $elements) {
   console.log(element);
}

<input type="text" [(ngModel)]="myModel" (blur)="onBlurMethod()">

export class AppComponent {
    searchForm: ControlGroup;
    results: Observable<any[]>;

    constructor(private http: Http) {
        let searchField = new Control();
        this.searchForm = new ControlGroup({searchField});
        this.results = searchField.valueChanges
                  .debounceTime(500)
                  .switchMap((val:string) => {
                         return this.search(val);
                  });
    }

public class LowerThanAttribute : ValidationAttribute
{
    public LowerThanAttribute(string dependentPropertyName)
    {
        DependentPropertyName = dependentPropertyName;
    }

    public string DependentPropertyName { get; set; }
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        int? currentPropertyValue = value as int?;
        currentPropertyValue ??= 0;
        var typeInfo = validationContext.ObjectInstance.GetType();
        var dependentPropertyValue = Convert.ToInt32(typeInfo.GetProperty(DependentPropertyName)
                                        .GetValue(validationContext.ObjectInstance, null));

        var displayDependentProperyName = typeInfo.GetProperty(DependentPropertyName)
                                        .GetCustomAttributes(typeof(DisplayAttribute), false)
                                        .Cast<DisplayAttribute>()
                                        .FirstOrDefault()?.Name;

        if (!(currentPropertyValue.Value < dependentPropertyValue))
        {
            return new ValidationResult("مقدار {0} باید کمتر باشد از " + displayDependentProperyName);
        }
        return ValidationResult.Success;
    }
}

public class LowerThanAttribute : ValidationAttribute, IClientModelValidator
{
    public LowerThanAttribute(string dependentPropertyName)
    {
        DependentPropertyName = dependentPropertyName;
    }

    public string DependentPropertyName { get; set; }

    public void AddValidation(ClientModelValidationContext context)
    {
        var displayCurrentProperyName = context.ModelMetadata.ContainerMetadata
                                            .ModelType.GetProperty(context.ModelMetadata.PropertyName)
                                            .GetCustomAttributes(typeof(DisplayAttribute), false)
                                            .Cast<DisplayAttribute>()
                                            .FirstOrDefault()?.Name;

        var displayDependentProperyName = context.ModelMetadata.ContainerMetadata
                                            .ModelType.GetProperty(DependentPropertyName)
                                            .GetCustomAttributes(typeof(DisplayAttribute), false)
                                            .Cast<DisplayAttribute>()
                                            .FirstOrDefault()?.Name;


        MergeAttribute(context.Attributes, "data-val", "true");
        MergeAttribute(context.Attributes, "data-val-lowerthan", $"{displayCurrentProperyName} باید کمتر باشد از {displayDependentProperyName}");
        MergeAttribute(context.Attributes, "data-val-dependentpropertyname", "#" + DependentPropertyName);
    }
    private  bool MergeAttribute(IDictionary<string, string> attributes, string key, string value)
    {
        if (attributes.ContainsKey(key))
        {
            return false;
        }
        attributes.Add(key, value);
        return true;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        int? currentPropertyValue = value as int?;
        currentPropertyValue ??= 0;
        var typeInfo = validationContext.ObjectInstance.GetType();
        var dependentPropertyValue = Convert.ToInt32(typeInfo.GetProperty(DependentPropertyName)
                                        .GetValue(validationContext.ObjectInstance, null));

        var displayCurrentProperyName = typeInfo.GetProperty(DependentPropertyName)
                                        .GetCustomAttributes(typeof(DisplayAttribute), false)
                                        .Cast<DisplayAttribute>()
                                        .FirstOrDefault()?.Name;

        if (!(currentPropertyValue.Value < dependentPropertyValue))
        {
            return new ValidationResult("مقدار {0} باید کمتر باشد از " + displayCurrentProperyName);
        }
        return ValidationResult.Success;
    }
}

jQuery.validator.addMethod("lowerthan", function (value, element, param) {
    var otherPropId = $(element).data('val-dependentpropertyname');
    if (otherPropId) {
        var otherProp = $(otherPropId);
        if (otherProp) {
            var otherVal = otherProp.val();
            if (parseInt(otherVal) > parseInt(value)) {
                return true;
            }
            return false;
        }
    }
    return true;
});
jQuery.validator.unobtrusive.adapters.addBool("lowerthan");

<script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
<script src="~/js/LowerThan.js"></script>

public class User
{
    [Required]
    [Display(Name ="نام کاربری")]
    public string Username { get; set; }
    [Required]
    [Display(Name = "سن")]
    public int Age { get; set; }
    [LowerThan(nameof(Age))]
    [Required]
    [Display(Name = "سابقه کار")]
    public int Experience { get; set; }
}

 PM> Install-Package RavenDB.Embedded -Pre

 var documentStore = new EmbeddableDocumentStore { DataDirectory = @"~/app_data/ravendb" };
documentStore.Initialize();

<connectionStrings>
  <add name="Local" connectionString="DataDir = ~\Data"/>

 var documentStore = new EmbeddableDocumentStore{RunInMemory = true}.Initialize()

 NonAdminHttp.EnsureCanListenToWhenInNonAdminContext(8080);

// Start the HTTP server manually
var server = new RavenDbHttpServer(documentStore.Configuration, documentStore.DocumentDatabase);
server.Start();

 d:\ravendb\server> .\raven.server.exe /install

 d:\ravendb\server> .\raven.server.exe /uninstall

 PM> Install-Package RavenDB.AspNetHost -Pre

- Adblock Plus 2.1.2
http://adblockplus.org/en/
- Add to Search Bar 2.0
http://firefox.maltekraus.de/extensions/add-to-search-bar
- Calculator 1.1.27
http://code.google.com/p/firefoxcalculator/
- CodeBurner for Firebug 1.6
http://tools.sitepoint.com/codeburner
- ColorZilla 2.8.1
http://www.colorzilla.com/
- Cookies Manager+ 1.5.1
https://addons.mozilla.org/en-US/firefox/addon/cookies-manager-plus/
- CSS Usage 0.2.9
http://spaghetticoder.org/cssusage/
- DOM Inspector 2.0.12
http://www.mozilla.org/projects/inspector/
- Extension List Dumper 1.15.2
http://www.sogame.cat/
- File Title 1.4
http://www.jasnapaka.com/mozilla/filetitle/
- Firebug 1.10.2
http://www.getfirebug.com/
- FireDiff 1.2.0
http://www.incaseofstairs.com/firediff
- Firefinder for Firebug 1.04
http://robertnyman.com/firefinder/
- FireFTP 2.0.7
http://fireftp.mozdev.org
- FireQuery 1.2
http://firequery.binaryage.com
- Forecastfox 2.2.1
http://www.getforecastfox.com/
- Greasemonkey 1.0
http://www.greasespot.net/
- HighlightAll 1.6
http://jgoudey.free.fr/highlightall/
- HttpFox 0.8.11
http://code.google.com/p/httpfox/
- IranianCalendar 3.1.20081222
http://www.alavi.us/jcal/
- Linky 3.0.0
http://gemal.dk/mozilla/linky.html
- MeasureIt 0.4.10
http://frayd.us/
- Open With 5.2.1
http://www.darktrojan.net/software/addons/openwith/
- PDF Download 3.0.0.2
http://www.pdfdownload.org
- Pixel Perfect 1.7.1
http://www.pixelperfectplugin.com/
- Pray Times! 1.1.7
http://praytimes.org/
- Proxy Selector 0.80.7
http://addons.mozilla.org
- Right-Click-Link 1.1.5
http://rickardandersson.com/
- SearchPreview 5.9
http://searchpreview.de/
- Server Spy 0.2.1
http://www.jacquet80.eu/mozilla/exts/ServerSpy/
- Session Manager 0.7.9
http://sessionmanager.mozdev.org/
- Show MyIP 0.8
http://www.tsql.de/download/firefox-addon-ip-adresse-ip-address
- Show Picture 2.7
https://addons.mozilla.org/en-US/firefox/addon/show-picture/?src=api
- Showcase 0.9.5.8
http://showcase.uworks.net/
- Snap Links Plus 2.2.1
http://snaplinks.mozdev.org/
- Sothink Web Video Downloader for Firefox 6.8
http://www.web-video-downloader.com
- Speed Dial 0.9.6.8
http://speeddial.uworks.net/
- SQLite Manager 0.7.7
http://sqlite-manager.googlecode.com/
- Stylish 1.2.6
http://userstyles.org/
- Subtitle Matcher 0.3.4
http://ds6.ovh.org/hashsubtitles/subtitle_matcher_firefox_extensions.php
- Tilt 1.0.1
http://blog.mozilla.com/tilt/
- UnMHT 5.7.5
http://www.unmht.org/unmht/en_index.html
- UnPlug 2.050
http://unplug.dbatley.com/
- User Agent Switcher 0.7.3
http://chrispederick.com/work/user-agent-switcher/
- View Source Chart 3.05
http://zigrat.com
- Viewstate Size 1.0.4
http://www.kirkov.dk/projects/firefox/viewstatesize
- Web Developer 1.2.1
http://chrispederick.com/work/web-developer/firefox/
- YSlow 3.1.4
http://developer.yahoo.com/yslow