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    copied!<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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