<p>First of all, I'd like to say that this site is great!</p>

<p>My question is, what are the reasons for the following 2 error messages?</p>

<p>1) In VB.NET (I know this is a C# forum but my next question is from C# experience), property evaluation failed (I do this when putting a watch on an exception variable).</p>

<p>2) In C#, method or class (Can't remember which) does not have a constructor. I think I got this with HttpContext or HttpApplication, which is a class if I remember correctly? Pretty sure it is as it has its own properties and methods.</p>

<p>Thanks</p>

1) Could be any number of reasons. Some properties just don't work nicely in a debugger. (Imagine watching DateTime.Now for changes!)
2) You're trying to create an instance of a class which doesn't have an appropriate accessible constructor. Usually either the class only has static members, or there's a static member you're meant to use to get an instance. (Having said that, both the classes you've mentioned have public constructors.)
More precise error messages and situation descriptions would be helpful.