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sql slow parameter

SQL: slow query with parameters

In my C# reporting program I had a query which was giving me timeouts. The part that gave me trouble was something similar to:


FROM invoices

WHERE processdate BETWEEN @from AND @until
AND printdate > accountingdate

If I defined the @from and @until variables in the query, i.e. if I prepend it with:

DECLARE @from datetime = '2015-01-08'
DECLARE @until datetime = '2015-01-14'

everything ran very fast as expected.

But when I run the query from my C# program the parameters get added like this:

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