im fairly new to umbraco (and mvc) so busy learning both while developing a new website. my current task is adding a search functionality to the site. i am planning to use the examine indexer.

i have created a search model with a searchterm property and created my searchbox as a partial view that can be included in my layout structure page.

@model Models.SearchModel

@using (Html.BeginUmbracoForm("SearchResults", "SearchSurface", null, new { @class = "search-form", @enctype = "multipart/form-data" }))

{    
    @Html.TextBoxFor(x => x.SearchTerm,  new{ @id = "search", @name="search", @placeholder="Search" })      <input type="submit" value="Search" class="btnSubmit" />  
}

However when i include this in my layout page 

<div class="grid_8">                  

@{ Html.RenderPartial("SearchBox"); } 

</div>

i get an error :-

The model item passed into the dictionary is of type 'Umbraco.Web.Models.RenderModel', but this dictionary requires a model item of type 'Models.SearchModel'.

how should i be trying to render this search box in my layout page?