Hi,

I'm building a business object ("Public Class Database") with a public 
property "DataSet".  What is the syntax for checking if the property 
Database.DataSet has been set or not in an instance of this class?  I 
thought it might be something like:

	If IsNothing (Database.DataSet)

but that doesn't work, and I haven't found anything looking through the 
SDK documentation either.


I get two error messages when I try and compile Database.vb (via the 
command line, no funds for VS.Net!):

Database.vb<40> : error BC30451 : Name 'IsNothing' is not declared

	pointing to the "IsNothing" in "If IsNothing (Database.DataSet)"
		

and

Database.vb<40> : error BC30469 : Reference to a non-shared member 
requires an object reference

	pointing to the "Database.DataSet" in "If IsNothing 
(Database.DataSet)"


Hope someone can help,

Thanks,

JON



+++++++++++
Database.vb
+++++++++++


Imports System
Imports System.Data
Imports System.Data.OleDb

Namespace BusinessObjects

	Public Class Database
		public DataSet as DataSet
	
		etc etc



  	public function CreateDataTableDefaultView(DataTableName as 
String, strQuery as string) as DataView
		If IsNothing (Database.DataSet)   'PRODUCES ERRORS ABOVE

Jon,

This is way over my head, but isn't 'Database' a reserved word?  (I've just
had to fix an Access DB for a colleague because they had set the project
name, filename AND main table name to 'Database'.)

It'd be a miracle if i'm right, but...

HTH,
Col

-----Original Message-----
From: Jon Maz [mailto:jonmaz@s...]
Sent: 11 April 2002 00:51
To: aspx_beginners
Subject: [aspx_beginners] Checking if a public property has been set


Hi,

I'm building a business object ("Public Class Database") with a public 
property "DataSet".  What is the syntax for checking if the property 
Database.DataSet has been set or not in an instance of this class?  I 
thought it might be something like:

	If IsNothing (Database.DataSet)

but that doesn't work, and I haven't found anything looking through the 
SDK documentation either.


I get two error messages when I try and compile Database.vb (via the 
command line, no funds for VS.Net!):

Database.vb<40> : error BC30451 : Name 'IsNothing' is not declared

	pointing to the "IsNothing" in "If IsNothing (Database.DataSet)"
		

and

Database.vb<40> : error BC30469 : Reference to a non-shared member 
requires an object reference

	pointing to the "Database.DataSet" in "If IsNothing 
(Database.DataSet)"


Hope someone can help,

Thanks,

JON



+++++++++++
Database.vb
+++++++++++


Imports System
Imports System.Data
Imports System.Data.OleDb

Namespace BusinessObjects

	Public Class Database
		public DataSet as DataSet
	
		etc etc



  	public function CreateDataTableDefaultView(DataTableName as 
String, strQuery as string) as DataView
		If IsNothing (Database.DataSet)   'PRODUCES ERRORS ABOVE


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Hi Col,

My code is an adaptation of code from ch 15 of "SAMS ASP.NET in 21 days", 
where they liberally use 'Database' as shown and it all compiles just fine 
and dandy.

Of course, the moment I tried to extend the code to do what I want, all 
hell broke loose and nothing worked (hence this mail) - but whatever I'm 
doing wrong, I'm pretty sure it isn't using a reserved word!

JON