@helper ListItem(string content) {
 <li>@content</li>
}
<ul>
 @foreach(var item in Model) {
 @ListItem(item)
 }
</ul>

@{
 Func<dynamic, HelperResult> ListItem = @<li>@item</li>;
}
<ul>
 @foreach(var item in Model) {
 @ListItem(item)
 }
</ul>

<header>  
    @if (IsSectionDefined("Header"))  
    {  
        @RenderSection("Header")  
    }  
    else  
    {  
        <div>Default Content for Header Section</div>  
    }  
</header>

public static HelperResult RenderSection(this WebViewPage page, string name,  
    Func<dynamic, HelperResult> defaultContent)  
{  
    if (page.IsSectionDefined(name))  
    {  
        return page.RenderSection(name);  
    }  
    return defaultContent(null);  
}

<header>  
   @this.RenderSection("Header", @<div>Default Content for Header Section</div>)  
</header>

@model IEnumerable<string>  
@{  
    ViewBag.Title = "Test";  
}

public ActionResult Index()  
{  
    var names = new string[]  
    {  
        "Vahid Nasiri",  
        "Masoud Pakdel",  
        ...  
     };  
  
    return View(names);  
}

public static HelperResult Repeater<T>(this HtmlHelper html,  
    IEnumerable<T> items,  
    Func<T, HelperResult> itemTemplate,  
    Func<T, HelperResult> alternatingitemTemplate = null,  
    Func<T, HelperResult> seperatorTemplate = null)  
{  
    return new HelperResult(writer =>  
    {  
        if (!items.Any())  
        {  
            return;  
        }  
        if (alternatingitemTemplate == null)  
        {  
            alternatingitemTemplate = itemTemplate;  
        }  
        var lastItem = items.Last();  
        int ii = 0;  
        foreach (var item in items)  
        {  
           var func = ii % 2 == 0 ? itemTemplate : alternatingitemTemplate;  
           func(item).WriteTo(writer);  
           if (seperatorTemplate != null && !item.Equals(lastItem))  
           {  
               seperatorTemplate(item).WriteTo(writer);  
           }  
           ii++;  
        }  
    });  
}

@Html.Repeater(Model, @<div>@item</div>, @<p>@item</p>, @<hr/>)

public class Product
{
        public int Id { set; get; }
        public string Name { set; get; }
}