What are all built-in abstract classes in .net fra

Question

I have been searching but unable to find a proper list. Can someone please name a few or gimme some link regarding that?

Answer 1

This (quick and dirty) program should give you a list to get started with from 4.0;

using System;
using System.IO;
using System.Reflection;

class Program
{
    static void Main(string[] args)
    {
        var assemblies = Directory.GetFiles("C:\\Windows\\Microsoft.NET\\Framework" + (Environment.Is64BitProcess ? "64" : "") + "\\v4.0.30319", "*.dll");

        foreach(var assembly in assemblies)
        {
            try
            {
                var loadedAssembly = Assembly.LoadFrom(assembly);
                var types = loadedAssembly.GetTypes();
                foreach(var type in types)
                    if(type.IsAbstract && type.IsClass)
                        Console.WriteLine(type.FullName);
            }
            catch
            {
                // Not an assembly? Ignore.
            }   
        }
    }
}