Check Value of @ID

I have the following code

declare @ID INT

SET @ID = (SELECT MyID
      Table1
      WHERE Field1 = '1')

if (DATALENGTH(@ID) = 0)
    BEGIN
        SET @ID = 1
        PRINT @ID
    END
else
    BEGIN
        set @ID = DATALENGTH(@ID)
        PRINT @ID
    END

I need to perform an Insert but I need to make sure that @ID does not contain a value.  How do I check?
LVL 2
CipherISAsked:
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cyberkiwiCommented:
Does not contain a value, so it is null?

If (@ID is null)
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cyberkiwiCommented:
Datalength(int) returns 4 by the way, since it takes 4 bytes to store any int
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Microsoft SQL Server 2005

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