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1. SelectListItem Extension Methods for... SelectListItem Extension Methods for DropDowns in MVC Core. Added ability to specify the option's Group, and for some bug fixes, more XML docs

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   public static class SelectListExtensionMethods

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   {

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       /// <summary>

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       /// The SelectListItem to use by default as the placeholder for select lists generated by these extension methods when the user needs to pick a value.

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       /// </summary>

2. Updated implementation of `BeginColl... Updated implementation of `BeginCollectionItem` to support nesting, not ignore the original `HtmlFieldPrefix`, and also provide overloads to let me decide the ID to use. Refactored to be a bit cleaner

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   public static class CollectionEditingHtmlExtensions

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   {

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       /// <summary>

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       /// Begins a collection item by inserting a hidden field for the index value

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       /// </summary>

3. Attribute to mark properties backed ... Attribute to mark properties backed by primitive types or structs (int, DateTime, Guid, etc) as requiring a value other than their default value. `RequireNonDefaultAttribute` alone is enough for Server side validation. If you want to use this for client side as well, you'll need the other files too.

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   using System.ComponentModel.DataAnnotations;

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   using Microsoft.AspNetCore.Mvc.DataAnnotations;

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   using Microsoft.Extensions.Localization;

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   public class CustomValidationAttributeAdapterProvider : IValidationAttributeAdapterProvider