gistfile1.cs

public class MyViewModel 
{
  // other crap...
  
  public string to_metadata()
  {
    var jq_meta = new
    {
    	required = IsRequired, 
    	messages = new { required = "gimme one, yo!"}
    };
    return new JQueryMeta().Serialize(jq_meta);
  }

}

gistfile2.htm

<!-- usage: -->
<input type="text" class="<%= model.to_metadata() %>" value="<%= model.value " />

<!-- renders: -->
<input type="text" class="{required:true, messages:{ required:'gimme one, yo!' }}" value="<%= model.value " />