How to handle the syntax for a Null date field in a SQL SERVER database using VB.NET

I have a SQL statement..

 Dim str As String = "UPDATE tExpress SET dtBagReturned = '" & lDate & "' WHERE iCustomerID = " & lnCustomerID

I only want to update the table if dtBagReturned is empty...how would the syntax look for a null date field in  a SQL server database..

Somebody me told a empty date field defaults to a value of # 01/01/01 12:00:00 AM #...so it is not realy empty..

I'm confused on how to change my sql to reflect the " empty" date field

Anyhelp or insight would be much appreciated...
           
nomar2Asked:
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bnavekeConnect With a Mentor Commented:
Dim str As String = "UPDATE tExpress SET dtBagReturned = '" & lDate & "' WHERE iCustomerID = " & lnCustomerID & " and dtBagReturned is null"

or

Dim str As String = "UPDATE tExpress SET dtBagReturned = '" & lDate & "' WHERE iCustomerID = " & lnCustomerID & " and isnull(dtBagReturned)"


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mydasxCommented:
compare your result to SQLDATETIME.NULL
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