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    <p>Behold the final solution:</p> <pre><code>public static class Helpers { public static string CheckboxGroup&lt;TModel, TProperty&gt;(this HtmlHelper&lt;TModel&gt; htmlHelper, Expression&lt;Func&lt;TModel, TProperty&gt;&gt; propertySelector, int value) where TProperty: IEnumerable&lt;int&gt; { var groupName = GetPropertyName(propertySelector); var modelValues = propertySelector.Compile().Invoke(htmlHelper.ViewData.Model); var svalue = value.ToString(); var builder = new TagBuilder("input"); builder.GenerateId(groupName); builder.Attributes.Add("type", "checkbox"); builder.Attributes.Add("name", groupName); builder.Attributes.Add("value", svalue); var contextValues = HttpContext.Current.Request.Form.GetValues(groupName); if ((contextValues != null &amp;&amp; contextValues.Contains(svalue)) || (modelValues != null &amp;&amp; modelValues.Contains(value))) { builder.Attributes.Add("checked", null); } return builder.ToString(TagRenderMode.Normal); } private static string GetPropertyName&lt;T, TProperty&gt;(Expression&lt;Func&lt;T, TProperty&gt;&gt; propertySelector) { var body = propertySelector.Body.ToString(); var firstIndex = body.IndexOf('.') + 1; return body.Substring(firstIndex); } } </code></pre> <p>And in your view:</p> <pre><code> &lt;%= Html.CheckboxGroup(model =&gt; model.DocumentCoverCustom, "1")%&gt;(iv),&lt;br /&gt; &lt;%= Html.CheckboxGroup(model =&gt; model.DocumentCoverCustom, "2")%&gt;(vi),&lt;br /&gt; &lt;%= Html.CheckboxGroup(model =&gt; model.DocumentCoverCustom, "3")%&gt;(vii),&lt;br /&gt; &lt;%= Html.CheckboxGroup(model =&gt; model.DocumentCoverCustom, "4")%&gt;(ix)&lt;br /&gt; </code></pre>
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    1. COI know this is super old but instead of returning string you should make the return value MvcHtmlString like the other @Html helpers in mvc. Replace `return builder.ToString(TagRenderMode.Normal);` with `return new MvcHtmlString(builder.ToString(TagRenderMode.SelfClosing));` this will output the html and give self closing tags since input's are typically self closing. Great solution though!
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      1. USMatt Phillips
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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