I’m running in to the same problem that Adi ran into wherein the DocumentCompleted event of the WebBrowser control is firing more than once. Sometimes a lot of times!

Seems to me that this should be a Once and Only Once type of thing.

Here’s my diagnostic output when I open techcrunch.com: the timestamped lines are the DocumentCompleted events; the others are the ProgressChanged events.

'Snapper.WinForm.vshost.exe' (Managed): Loaded 'C:\Windows\assembly\GAC_MSIL\System.Configuration\2.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
Uninitialized
Uninitialized
Uninitialized
Uninitialized
Uninitialized
'Snapper.WinForm.vshost.exe' (Managed): Loaded 'C:\Windows\assembly\GAC\Microsoft.mshtml\7.0.3300.0__b03f5f7f11d50a3a\Microsoft.mshtml.dll'
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
12/29/2007 1:00:23 PM - DocumentCompleted!
12/29/2007 1:00:24 PM - DocumentCompleted!
12/29/2007 1:00:25 PM - DocumentCompleted!
Interactive
Interactive
12/29/2007 1:00:27 PM - DocumentCompleted!
12/29/2007 1:00:29 PM - DocumentCompleted!
Interactive
Interactive
Interactive
Interactive
Interactive
12/29/2007 1:00:31 PM - DocumentCompleted!
Interactive
Interactive
Interactive
Interactive
Interactive
Interactive
12/29/2007 1:00:33 PM - DocumentCompleted!
Interactive
12/29/2007 1:00:35 PM - DocumentCompleted!
12/29/2007 1:00:36 PM - DocumentCompleted!
Interactive
Interactive
12/29/2007 1:00:40 PM - DocumentCompleted!
Complete
12/29/2007 1:00:41 PM - DocumentCompleted!

Aside from the fact that it took 18 seconds to get this page’s contents in code (whereas FasterFox reports 8 seconds in Flock), having 11 DocumentCompleted events seems a little odd.

UPDATE: Looking at this the answer seems to pop out at me.  Just wait for the ProgressChanged event to change to “Complete” before I do anything meaningful in the DocumentCompleted event handler.  I’ll give that a try right now.