Calling a Script Function from C# WebBrowser App?

[Bill]

Hello,

I'm trying to figure out how to call a script function
from a C# WebBrowser application analogous to the method
described in the article "HOWTO: Call a Script Function
from a VC WebBrowser Application". Can someone help here?

I am able to invoke a function from the DocumentComplete
event using the "execScript" method of the IHTMLWindow2
interface I retreved from the HTML document "Script"
object. This works but does not give me the control I
need to create a robust application that can gracefully
handle the absence of a function. If a function doesn't
exist on a specific page and the code blindly tries to
invoke it with "execScript" an error is visible to the
user and this is confusing to the end user. The app user
should not know anything about a missing method/script
error. I need to be able to signal a meaningful error
message.

I want to lookup IF a method exists and then if it does,
invoke it and retrieve results (if any). I also want to
be able to avoid invoking a method IF it DOES NOT exist.
This is the reason I need more control than "execSctipt"
gives me.

Thanks in advance,

- Bill