public override void Process(TagHelperContext context, TagHelperOutput output)
        {
            output.TagMode = TagMode.StartTagAndEndTag;
            output.TagName = "div";
            output.Attributes.Add(new TagHelperAttribute("class", "tags"));
            output.Attributes.Add(new TagHelperAttribute("id", "tags"));

            var inputTagBuilder = new TagBuilder("input");

            inputTagBuilder.Attributes.Add("name", Name);
            inputTagBuilder.Attributes.Add("class", Class);
            inputTagBuilder.Attributes.Add("id", Id);
            inputTagBuilder.Attributes.Add("placeholder", Placeholder);
            if (Required)
            {
                inputTagBuilder.Attributes.Add("required", null);
            }
            inputTagBuilder.Attributes.Add("value", SelectedItems.JoinAsString(","));

            output.Content.AppendHtml(inputTagBuilder);
        }