Method 'XYZ' cannot be reflected

Question

We have consumed a third party web service and are trying to invoke it from an ASP.NET web application. However when I instantiate the web service the following System.Inval

Answer 1

In my case I was getting a "method cannot be reflected" error due to that fact that in the class being returned by method, I had failed to expose a default parameter-less constructor.

I was working in VB.NET. In my return class I had declared a "New(..)" method that took a couple parameters (because that is how I wanted to use it in my code). But by doing so, I had supressed the default (hidden) parameterless New() constructor that VB adds behind the scenes. Apparently the web service handler requires that a parameterless constructor be available. As soon as I added back into my class a parameterless New() constructor, it all worked fine.