Comments on: Invalid Use of Default Parameter http://blog.stevex.net/2005/11/invalid-use-of-default-parameter/ Software development and other notes. Tue, 15 Jun 2010 13:44:34 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Jeremy http://blog.stevex.net/2005/11/invalid-use-of-default-parameter/comment-page-1/#comment-453968 Jeremy Fri, 31 Oct 2008 16:30:23 +0000 http://blog.stevex.net/index.php/2005/11/16/invalid-use-of-default-parameter/#comment-453968 Note that if you're using an ADO Command object and parameterising a query in VBScript ASP Classic, you'll get this message if you're passing the wrong type of null value to a column that DOES allow nulls. By default, if you leave the value of a parameter unset, it'll be set to the special value DBNull, which is defined in VBScript; contrary to other types of .NET programming, you have to use the regular VBScript null value: if (Request.form("email") "") then .parameters("Email").value = Request.form("email") else .parameters("Email").value = null end if If you didn't have the "else" there, the value would default to DBNull and fail with the above error. Note that if you’re using an ADO Command object and parameterising a query in VBScript ASP Classic, you’ll get this message if you’re passing the wrong type of null value to a column that DOES allow nulls. By default, if you leave the value of a parameter unset, it’ll be set to the special value DBNull, which is defined in VBScript; contrary to other types of .NET programming, you have to use the regular VBScript null value:

if (Request.form(“email”) “”) then
.parameters(“Email”).value = Request.form(“email”)
else
.parameters(“Email”).value = null
end if

If you didn’t have the “else” there, the value would default to DBNull and fail with the above error.

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