How to load File.html from resources into WebBrowser component?

You don't say exactly what you're having difficulty with, so here is the whole process:

1) Make sure File.html is included in the build.
Set the "Build Action" property to "Embedded Resource".

2) Get the name of the resource

string[] a = Assembly.GetEntryAssembly().GetManifestResourceNames();
foreach ( string s in a ) Debug.WriteLine( "\t" + s );

3) Extract the resource:

string html = null;
using ( var s = Assembly.GetExecutingAssembly()
    .GetManifestResourceStream( "[name of resource.html]" ) )
using ( var r = new StreamReader( s ) )
    html = r.ReadToEnd();

4) Load in WebBrowser control:

webBrowser1.DocumentText = html;

Nick