Windows Search Error 0x80004005 when I use wilcards and empty text

Hello all.

I hope you can help me. I'm trying to use the Windows Search but my code throws an exception whether I use wilcards ( &, *, _, ...) or empty text.

My code is:

string sentence = "Select System.ItemName, System.ItemPathDisplay, System.ItemUrl from SystemIndex where " +

"CONTAINS('" + this.SearchString.Text + "') AND SCOPE = 'file:myscope'";

Then I execute the code but I get the next exception if SearchString.Text is empty or a wilcard.

IErrorInfo.GetDescription failed with E_FAIL(0x80004005).

The directory where I am searching is indexed and I select 'files and content'. If SearchString.Text contains a word, it works properly but it doesn't work in the other cases.

Could someone help me, please?

Thanks so much!

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