@using Sitecore.Mvc
 @using Sitecore.Mvc.Presentation
 @model RenderingModel
 @{

       var list = @Model.Item.ID;//this value has to be passed to
                                 //layout rendering

 }

@model RenderingModel
    @{
       var list = @Model.Item.ID;
       Layout = null;
     }

  <div id="dd_DivWell" class="btn btn-primary">
  <a id="lnkOverview" href="@Url.Action("Index", "WellnessService",new
  {Property= list })"><span class="nameText">Wellness Service</span>
  </a>
  </div>