A strongly typed ad-hoc solution would use tuples to pass more than one value to the cshtml view:

Example - I will pass 2 data to CSHTML (the view model and a string representing the key):

In the view do so:

@model Tuple<MinhaClasse, string>

<p><strong>Nome:</strong> @Model.Item1.Nome<p>
<p><strong>Chave:</strong> @Model.Item2<p>

And in the controller:

public ActionResult Metodo()
{
    MinhaClasse viewModel = ...; // esse é o seu View-Model
    string chave = ...; // essa é a chave que quer passar pra view

    return this.View(Tuple.Create(
        viewModel,
        chave
      ));
}

Other ways

If you want a more encapsulated form, I recommend creating a view-model class that contains all of the data for that particular view ... so you would not need to use Tuple.

There is still another encapsulate if you want to pass a certain data to all views, or at least for most views: extend the WebViewPage class ... but that's a lot more work, really is the opposite of an ad-hoc solution such as tuple.

If it is a more elaborate case send a comment that I amplify the answer accordingly.

I'll teach you two more sophisticated methods to get heavily typed values in your View .

Method 1: Deriving System.Web.Mvc.WebViewPage

Create something like this:

namespace SeuProjeto.Infrastructure.ViewPages
{
    public abstract class MinhaWebViewPage : WebViewPage
    {
        public string ReportServer { get; set; }
    }

    public abstract class MinhaWebViewPage<TModel> : WebViewPage<TModel>
    {
        public string ReportServer { get { return // defina o valor aqui } }
    }
}

In Views/Web.config (not the root directory), change the following:

<system.web.webPages.razor>
  <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
  <!--<pages pageBaseType="System.Web.Mvc.WebViewPage">-->
  <pages pageBaseType="SeuProjeto.Infrastructure.ViewPages.MinhaWebViewPage">
    ...
  </pages>
</system.web.webPages.razor>

Close your Views and reopen. You will see that @ReportServer can be added to your View without errors.

Method 2: Extending System.Web.Mvc.WebViewPage

Create something like this:

namespace SeuProjeto.Infrastructure.Extensions
{
    public static class WebViewPageExtensions
    {
        public string ReportServer(this System.Web.Mvc.WebViewPage webViewPage)
        {
            return // retorne seu valor aqui
        }
    }
}

Usage:

@this.ReportServer()