Umbraco pagination

@inherits Umbraco.Web.Mvc.UmbracoTemplatePage
@using umbraco.cms.businesslogic.Tags

@{     
    @* grab your selection of content line normal *@

    @* set the page size and check for the query string "page" *@
    var pageSize =10;
    var page =1;int.TryParse(Request.QueryString["page"],out page);
    
    var totalPages =(int)Math.Ceiling((double)selection.Count()/(double)pageSize);

    if(page > totalPages)
    {
            page = totalPages;
    }
    else if (page < 1)
    {
            page =1;
    }
    @* end pagination *@
}



@if (selection.Any())
{
    
        @* render posts here *@
    
}

@{
    @* draw pagination nav *@
    if (totalPages > 1){
    var previousPageIsEllipsis = true;
      <nav class="pager">
          <ul>
            @if (page > 1)
            {
              <li><a href="?page=@(page-1)">&lt; Prev</a></li>
            }
            @for (int p = 1; p < totalPages + 1; p++)
            {
              var linkClass = (p == page) ? "disabled" : "active";
              if (p == page){
                <li class="@Html.Raw(linkClass)"><a href="?page=@p">@p</a></li>
                previousPageIsEllipsis = false;
              }else{
                if( p == 1
                    || p == page - 1
                    || p == page + 1
                    || p == totalPages - 1
                    || p == totalPages){    
                      <li class="@Html.Raw(linkClass)"><a href="?page=@p">@p</a></li>
                      previousPageIsEllipsis = false;
                    }else{
                      if (previousPageIsEllipsis){
                        continue;
                      }else{
                        <li class="ellipsis">...</li>
                        previousPageIsEllipsis = true;
                      }
                    }
              }      
            }

            @if (page < totalPages)
            {
              <li><a href="?page=@(page+1)">Next &gt;</a></li>
            }
          </ul>
      </nav>
    }
    @* end nav *@
}