[HtmlTargetElement(Attributes = "asp-name")]

     public class NameTagHelper : TagHelper

     {

         private const string NameAttributeName = "asp-name";

         [HtmlAttributeName(NameAttributeName)]

         public ModelExpression Name { get; set; }

         [ViewContext, HtmlAttributeNotBound]

         public ViewContext ViewContext { get; set; }

         private IHtmlGenerator _generator;

         public NameTagHelper(IHtmlGenerator generator)

         {

             this._generator = generator;

         }

         public override void Process(TagHelperContext context, TagHelperOutput output)

         {

             if (context == null)

             {

                 throw new ArgumentNullException(nameof(context));

             }

             if (output == null)

             {

                 throw new ArgumentNullException(nameof(output));

             }

             if (this.Name != null)

             {

                 if (this.Name.Metadata == null)

                 {

                     throw new ArgumentException(nameof(Name));

                 }

                 string value = NameAndIdProvider.GetFullHtmlFieldName(ViewContext, this.Name.Name);

                 output.Attributes.SetAttribute("name", value);

             }

         }

     }

     [HtmlTargetElement(Attributes = "asp-id")]

     public class IdTagHelper : TagHelper

     {

         private const string IdAttributeName = "asp-id";

         [HtmlAttributeName(IdAttributeName)]

         public ModelExpression Id { get; set; }

         [ViewContext, HtmlAttributeNotBound]

         public ViewContext ViewContext { get; set; }

         private IHtmlGenerator _generator;

         public IdTagHelper(IHtmlGenerator generator)

         {

             this._generator = generator;

         }

         public override void Process(TagHelperContext context, TagHelperOutput output)

         {

             if (context == null)

             {

                 throw new ArgumentNullException(nameof(context));

             }

             if (output == null)

             {

                 throw new ArgumentNullException(nameof(output));

             }

             if (this.Id != null)

             {

                 if (this.Id.Metadata == null)

                 {

                     throw new ArgumentException(nameof(Id));

                 }

                 string idFieldName = NameAndIdProvider.GetFullHtmlFieldName(ViewContext, this.Id.Name);

                 string idFieldValue = NameAndIdProvider.CreateSanitizedId(this.ViewContext, idFieldName, _generator.IdAttributeDotReplacement);

                 output.Attributes.SetAttribute("id", idFieldValue);

             }

         }

     }