Help optmizing a stored proc

I have this

CREATE PROCEDURE dbo.cmsGetTaskOrdersAndFunding2
(
@.FundingDate SMALLDATETIME,
@.BillingContractID INT, -- null for all contracts
@.Filter BIT = NULL

)
AS
-- get list of taskorders with their respective fundingtotals as of
specified date
IF @.Filter IS NULL
BEGIN
SELECT TO1.TaskOrderID
FROM TaskOrder TO1
LEFT OUTER JOIN
WHERE (@.BillingContractID IS NULL OR TO1.BillingContractID =
@.BillingContractID)
END
ELSE
BEGIN
SELECT TO1.TaskOrderID,
FROM TaskOrder TO1
WHERE (@.BillingContractID IS NULL OR TO1.BillingContractID =
@.BillingContractID) AND TO1.Retired <> @.Filter
END

RETURN
GO
------
Is there a less redundant way to write this? basically @.Filter is an
optional parameter, if it isn't present, I want to return all records and if
it is present all records where Retired <> @.Filter. Any ideas? Can I wrap
the WHERE clause in an if statement? Or is there a better way?

TIA,
ChrisJust one block:

-- get list of taskorders with their respective fundingtotals as of
specified date
SELECT TO1.TaskOrderID,
FROM TaskOrder TO1
WHERE (@.BillingContractID IS NULL OR TO1.BillingContractID =
@.BillingContractID)
AND (@.Filter IS NULL OR TO1.Retired <> @.Filter)

Note this last line. If @.Filter is NULL, the entire block is ALWAYS
true so "TO1.Retired <> @.Filter" doesn't matter. If @.filter is not
null, "TO1.Retired <> @.Filter" is the part that matters.|||Sweet! Thanks man.

"figital" <mharen@.gmail.com> wrote in message
news:1141927222.299970.274010@.i39g2000cwa.googlegr oups.com...
> Just one block:
> -- get list of taskorders with their respective fundingtotals as of
> specified date
> SELECT TO1.TaskOrderID,
> FROM TaskOrder TO1
> WHERE (@.BillingContractID IS NULL OR TO1.BillingContractID =
> @.BillingContractID)
> AND (@.Filter IS NULL OR TO1.Retired <> @.Filter)
> Note this last line. If @.Filter is NULL, the entire block is ALWAYS
> true so "TO1.Retired <> @.Filter" doesn't matter. If @.filter is not
> null, "TO1.Retired <> @.Filter" is the part that matters.