I have got it working in VB, usesing VS 2010, I an not sure why you are having problems, maybe try removing ref and re adding and rebuild project Dim coloredCode As ColorCode.CodeColorizer = New ColorCode.
Dim sourceCode As String = My.Resources.Resources.IHttpModule
Dim colorizedSourceCode As String = coloredCode.Colorize(sourceCode, ColorCode.Languages
.VbDotNet)