Store procedure returned null value

I have problem on stored procedure after executing it

This is the select statement inside the stored procedure:
select sum(amt) as total from orders where order_Date = today

The problem occurs when there is no record or orders on a specific date.
How could I check if the value returned is null or there is no record found in vb.net?

Hope someone could help me on this. Thanks!!!

2 solutions:

in SQL (Ms SQL) for example:

Code:

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SELECT IsNUll((select sum(amt) as total from orders where order_Date = today),0)

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in VB use .IsNull (as I remember) method of DataReader or DataTable

SQL Server 2000

SELECT COALESCE(sum(amt),0) as total from orders where order_Date = today