Visual Studio: How to figure out where this type is defined?

Answer 1

You can use the Object.GetType() method to obtain information about a particular object you got.

Here's an example:

using System;

static class Program
{
    static void Main()
    {
        var obj = new { Random = "Object" } as object;

        var t = obj.GetType();

        var asm = t.Assembly;

        Console.WriteLine("Type name     : " + t.FullName);
        Console.WriteLine("Namspace      : " + t.Namespace);
        Console.WriteLine("From assembly : " + asm.FullName);
        Console.WriteLine("Located at    : " + asm.Location);

        Console.ReadKey();
    }
}

Or in your case...

var t = ie.Document.GetType()

...should give you type information about what is it that is really inside ie.Document.

Answer 2

A quick search on MSDN gets me to this page which describes how to get the document interface: About MSHTML
Note: I cannot try any of this as I am stuck with VS.80

Answer 3

Just add a reference to Microsoft.mshtml. 'Nuff said.

Added: OK, a few more words - .NET programs operate with COM objects through these interop assemblies. If you add a reference to a COM object in Visual Studio, VS generates one for you. For the WebBrowser there is already one pre-generated, because it's so often used. But you can't operate with COM "directly". Well, maybe you can, but that would be masohistic.