title: Using the generic type 'System.Collections.Generic.List<T>' requires 1 type arguments
body: <p>What does it mean? I used a list of list in ASP.NET MVC and sent them through <code>ViewData</code> of <code>ActionResuls</code> to retrieve it in views.</p>
  
  <p>However, when I change it to list of list, it gives me an error of <code>HttpWebException</code>. When I check it inside the immediate window, it tells me that the error is:</p>
  
  <blockquote>
    <p>Using the generic type 'System.Collections.Generic.List&lt;T>' requires 1 type arguments</p>
  </blockquote>
  
  <p>So, what does it mean and what did I do wrong using it?</p>