Thanks Joe, that really helped.
I tried same approach while searching hashtags. I am trying a very popular hashtag in my country, #occupygezi. I believe this hashtag started in early june. But when I try this approach the earliest status I get is from september 22nd.
The code I am using is like this:
(from search in twitterCtx.Search
where search.Type == SearchType.Search
&& search.Query == hashtagName
&& search.SinceID == sinceID
&& search.Count == Count
&& search.MaxID == maxID
... where hashtagName is occupygezi, not #occupygezi or something.
Thanks for any help.