Update the UI while class library is busy

Hi,
I am working on an existing winforms application which contains a UI layer and a Database layer which communicate with each other using a Business layer. That makes 1 winforms application and 2 Class libraries.
I recently implemented a mechanism which allows the UI to be responsive while the DBLayer is working on a long running query. This involved the Query to be run on a BackgroundWorker and a while loop waits in the DBLayer method for the query to
complete in the background thread. While waiting I fire and event from the DBLayer which is handled on the UI layer and I run Application.DoEvents() which helps the UI be responsive.
This solution is working fine but I have a problem now that since the UI is responsive the users are clicking on other buttons and causing an inconsistency of state.
So I was wondering if there is a mechanism to make the UI responsive but not allow the buttons to be clicked (by responsive UI I mean the page shouldnt appear hanged while users drag the form around or when they click on various sections on the form)
or cancel all the events for a certain time ?
Also is there a way to make the UI responsive other than Application.Doevents()
I cannot implement threading or BackgroundWorker in the UI.
-Ajay

Just an update :
I am now looking forward to using the DisableProcessWindowsGhosting() from user32.dll to solve my problem.
This removes the message "Not Responding" from the title bar and the close (X) button is not enabled. So the user has to wait for the response.
My initial issue was : When the form waits for a response from the DBlayer the users try to interact with the form and windows ghosting kicks in after about
5 seconds. Then the form appears to have hung and the user closes the windows (as the close button(X) is still enabled). This becomes a problem as we have open connections. And other technical issues arise since the form didnt close properly(as the process
was killed).
Windows Ghosting E.g.:
I couldnt implement the enabled and disable controls suggestion as there are many forms and its and existing application which would make testing any
code change a huge effort.
The Application.DoEvents() also left a lot of room for new issues as windows messages that should be in the queue and processed after DBLayer response would
be processed before response.
After disabling windows ghosting the user has to wait for the window to repond (which happens after the DBLayer responds). So the user cant close the window in a abrupt state.
Thanks ,
Ajay

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