help for using Find/Restrict method in outlook c# programming

[AV]

Hi,

I am trying to write some outlook add-in with c#. When I am using the
Restrict method to retrieve some items in a folder, I am difficult to code
the filter expression. Please help me or where can I find more information
on it? I just find some VB code, such as fldMail.Items.Restrict("[SentOn] >
'" & (Date - 7) & "' And [UnRead] = True And [Importance] = High"). But it
does not work in c#.

Thanks,