After adding a declaration to pipe in some text from our model in a view in one of our MVC apps:

@Model.Project

I was hit with the above error message:

CS0135: 'Model' conflicts with the declaration 'System.Web.Mvc.WebViewPage<TModel>.Model'

it turns out that the person that had originally authored the view had used the upper case Model in some HtmlHelper calls like so:

@Html.HiddenFor(Model => Model.Project)

A quick change to using either the lower case variant of model (or even a completely different identifier) for the parameter of the lambda fixed this up.

Hopefully this helps someone else when they come across it.