Using the generic type 'System.Collections.Generic.List<T>' requires 1 type arguments

What does it mean? I used a list of l开发者_开发技巧ist in ASP.NET MVC and sent them through ViewData of ActionResuls to retrieve it in views.

However, when I change it to list of list, it gives me an error of HttpWebException. When I check it inside the immediate window, it tells me that the error is:

Using the generic type 'System.Collections.Generic.List<T>' requires 1 type arguments

So, what does it mean and what did I do wrong using it?

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The List<T> class is a generic type.

In order to use it, you need to provide a type argument.

For example, if you want to have a list of integers, you need to declare it as List<int>, not List.

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I guess you wrote something like List<List>> ...
But there is no class named List.. - List has a generic type parameter.
For example - list of lists of integers should be

List<List<int>> listOfLists = .....

For better understanding of C# generics take a look here.

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I was able to just use using System.Collections.Generic; to get access to lists.