Checking for NULL

If believe I've seen this done before, but how do I handle a NULL from a database on this statement:


I know I could first do:

If Not IsDBNull(Reader.Item(Reader.GetOrdinal("location"))) then

but is there a way on the Reader statement to tell it to convert NULL to a space for text and 0 for numeric?  
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
the easiest would be to do that in the SQL directly ...
as there you have the "isnull" function (ms sql server), nvl (oracle), nz (ms access) etc ...

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I usually add an Extension method to the project and use it like this

Textbox1.Text = IsStringNull(reader.item(1))
TextBox2.Text = IsIntNull(reader.item(2))
Éric MoreauSenior .Net ConsultantCommented:
in your sql query, you can do this:
select field1, field2, isnull(location, 0) as location from tablename
Shahan AyyubSenior Software EngineerCommented:
You may use:

IIF(IsDBNull(Expression) and (Not Information.IsNumeric(Expression)) , " ", IIF(Information.IsNumeric(Expression) and IsDBNull(Expression), 0 , defaultvalue)

Also, you can use Coalesce() in SQL which returns first Non-null value.
HLRosenbergerAuthor Commented:
Thanks.  IsNull works fine for what I want.
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