Value cannot be null

[Paul]

Hi,

I'm new to .NET and I'm trying to run through the tutorial
"Creating a Web Application Using VB"

As I follow the directions, It seems to work just fine.

I can preview the data from the SQLDataAdapter but when I
try to view the data in the browser I get the error:


Value cannot be null. Parameter name: dataSet
Description: An unhandled exception occurred during the
execution of the current web request. Please review the
stack trace for more information about the error and
where it originated in the code.

Exception Details: System.Argument NullException: Value
cannot be null. Parameter name: dataSet

Source Error:

Line 2: Inherits System.Componen tModel.Componen t
Line 3: Public Sub FillDataSet(ByV al dSet As
myDataSet)
Line 4: SqlDataAdapter1 .Fill(dSet)
Line 5: End Sub
Line 6: #Region " Component Designer generated code "

Any help would be appreciated. thx.

Paul
801.366.0224
ptoyn@yahoo.com

[Guy Bradley]

Re: Value cannot be null

> Exception Details: System.Argument NullException: Value[color=blue]
> cannot be null. Parameter name: dataSet
>
> Source Error:
>
> Line 2: Inherits System.Componen tModel.Componen t
> Line 3: Public Sub FillDataSet(ByV al dSet As
> myDataSet)
> Line 4: SqlDataAdapter1 .Fill(dSet)
> Line 5: End Sub
> Line 6: #Region " Component Designer generated code "[/color]

The error message means that you have not instantiated the dataset object
you are trying to fill

Dim dSet as new Dataset.

Public Sub FillDataSet(ByV al dSet)
SqlDataAdapter1 .Fill(dSet)
End Sub

[Guest]

Re: Value cannot be null

Thanks for a quick reply; howerver,

doens't line 3 below instantiate the dataset?
[color=blue]
>-----Original Message-----[color=green]
>> Exception Details: System.Argument NullException: Value
>> cannot be null. Parameter name: dataSet
>>
>> Source Error:
>>
>> Line 2: Inherits System.Componen tModel.Componen t
>> Line 3: Public Sub FillDataSet(ByV al dSet As
>> myDataSet)
>> Line 4: SqlDataAdapter1 .Fill(dSet)
>> Line 5: End Sub
>> Line 6: #Region " Component Designer generated code "[/color]
>
>The error message means that you have not instantiated[/color]
the dataset object[color=blue]
>you are trying to fill
>
>Dim dSet as new Dataset.
>
>Public Sub FillDataSet(ByV al dSet)
> SqlDataAdapter1 .Fill(dSet)
>End Sub
>
>
>.
>[/color]

[William Ryan eMVP]

Re: Value cannot be null

Nothing in this code Instantiates a dataset. If the calling code passed in
an Instantiated dataset, it would be ok. what does the caller look like?
before you pass in the dataset do you create a new Datasst

Dim myDS as New DataSet?
<anonymous@disc ussions.microso ft.com> wrote in message
news:58c101c42d 41$71a9bcd0$a50 1280a@phx.gbl.. .[color=blue]
> Thanks for a quick reply; howerver,
>
> doens't line 3 below instantiate the dataset?
>[color=green]
> >-----Original Message-----[color=darkred]
> >> Exception Details: System.Argument NullException: Value
> >> cannot be null. Parameter name: dataSet
> >>
> >> Source Error:
> >>
> >> Line 2: Inherits System.Componen tModel.Componen t
> >> Line 3: Public Sub FillDataSet(ByV al dSet As
> >> myDataSet)
> >> Line 4: SqlDataAdapter1 .Fill(dSet)
> >> Line 5: End Sub
> >> Line 6: #Region " Component Designer generated code "[/color]
> >
> >The error message means that you have not instantiated[/color]
> the dataset object[color=green]
> >you are trying to fill
> >
> >Dim dSet as new Dataset.
> >
> >Public Sub FillDataSet(ByV al dSet)
> > SqlDataAdapter1 .Fill(dSet)
> >End Sub
> >
> >
> >.
> >[/color][/color]