Inherited forms

[RandyR]

I'm building a small desktop database app. I am building a template form that
has navigation and editing coded, and want to inherit this for my actual data
forms. When I add a form, and change the inherits statement to point to the
form I want, as soon as I try to view it in the designer I get an error:
Value can't be null. Parameter name: dataSource.
It looks like the parameter for the binding manager, so I tried removing the
reference in my template, and still get the error. I tried wrapping the
bindingmanager = me.bindingcontext(dataSource) in a try statement, and that
didn't help. I can't find any other place where a data source is referenced
in the template. Ideas much appreciated.

[EdB]

I think you're going about it in a manner not intended by Mr. Gates & co.

You have your base form. Then build your solution. Then, don't add a
Windows form, add an Inherited Form. Here, you will first Name your new
form, then, you will select which form it inherits from.

"RandyR" wrote:

I'm building a small desktop database app. I am building a template form that
has navigation and editing coded, and want to inherit this for my actual data
forms. When I add a form, and change the inherits statement to point to the
form I want, as soon as I try to view it in the designer I get an error:
Value can't be null. Parameter name: dataSource.
It looks like the parameter for the binding manager, so I tried removing the
reference in my template, and still get the error. I tried wrapping the
bindingmanager = me.bindingcontext(dataSource) in a try statement, and that
didn't help. I can't find any other place where a data source is referenced
in the template. Ideas much appreciated.

[RandyR]

I tried that, and get the same error. Thanks for the attempt.

"EdB" wrote:

I think you're going about it in a manner not intended by Mr. Gates & co.

You have your base form. Then build your solution. Then, don't add a
Windows form, add an Inherited Form. Here, you will first Name your new
form, then, you will select which form it inherits from.

"RandyR" wrote:

I'm building a small desktop database app. I am building a template form that
has navigation and editing coded, and want to inherit this for my actual data
forms. When I add a form, and change the inherits statement to point to the
form I want, as soon as I try to view it in the designer I get an error:
Value can't be null. Parameter name: dataSource.
It looks like the parameter for the binding manager, so I tried removing the
reference in my template, and still get the error. I tried wrapping the
bindingmanager = me.bindingcontext(dataSource) in a try statement, and that
didn't help. I can't find any other place where a data source is referenced
in the template. Ideas much appreciated.

[Cor Ligthert]

Randy,

The currencymanager fires often as well while initializing. So try to set
the code that uses binding inside a booleanswith what you set to true when
the initializing is done. We see not much from your code, so this is only a
big gues

I hope this helps?

Cor

"RandyR" <rr*****@nospam.att.net>

I tried that, and get the same error. Thanks for the attempt.

"EdB" wrote:

I think you're going about it in a manner not intended by Mr. Gates & co.

You have your base form. Then build your solution. Then, don't add a
Windows form, add an Inherited Form. Here, you will first Name your new
form, then, you will select which form it inherits from.

"RandyR" wrote:

> I'm building a small desktop database app. I am building a template
> form that
> has navigation and editing coded, and want to inherit this for my
> actual data
> forms. When I add a form, and change the inherits statement to point to
> the
> form I want, as soon as I try to view it in the designer I get an
> error:
> Value can't be null. Parameter name: dataSource.
> It looks like the parameter for the binding manager, so I tried
> removing the
> reference in my template, and still get the error. I tried wrapping the
> bindingmanager = me.bindingcontext(dataSource) in a try statement, and
> that
> didn't help. I can't find any other place where a data source is
> referenced
> in the template. Ideas much appreciated.

[Phill. W]

"RandyR" <rr*****@nospam.att.net> wrote in message
news:66**********************************@microsof t.com...

When I add a form, and change the inherits statement to point to
the form I want, as soon as I try to view it in the designer I get an error: Value can't be null. Parameter name: dataSource.

Do you need this code in your Base Class running in the Designer?
If not, try wrapping it in

If Not Me.DesignMode Then
' Code that only runs "for real".
End If

HTH,
Phill W.

[RandyR]

I can't pinpoint the code causing the failure - there's only one place where
I have a dataSource argument, and even deleting that line doesn't help. So I
don't know where this would fit.

"Phill. W" wrote:

"RandyR" <rr*****@nospam.att.net> wrote in message
news:66**********************************@microsof t.com...

When I add a form, and change the inherits statement to point to
the form I want, as soon as I try to view it in the designer I get an

error:

Value can't be null. Parameter name: dataSource.

Do you need this code in your Base Class running in the Designer?
If not, try wrapping it in

If Not Me.DesignMode Then
' Code that only runs "for real".
End If

HTH,
Phill W.

[RandyR]

I tried your suggestion, and still no success; could be I'm not placing
correctly. I added a form level variable in my base form set to false, and at
the end of the initialize routine set it to true. In the form load, I set the
binding manager; no joy. I also tried removing
manager=me.bindingcontext(MyData) before inheriting the form and no luck.
Could it be because I've got procedures that reference the binding manager?
Thanks for your help.

"Cor Ligthert" wrote:

Randy,

The currencymanager fires often as well while initializing. So try to set
the code that uses binding inside a booleanswith what you set to true when
the initializing is done. We see not much from your code, so this is only a
big gues

I hope this helps?

Cor

"RandyR" <rr*****@nospam.att.net>

I tried that, and get the same error. Thanks for the attempt.

"EdB" wrote:

I think you're going about it in a manner not intended by Mr. Gates & co.

You have your base form. Then build your solution. Then, don't add a
Windows form, add an Inherited Form. Here, you will first Name your new
form, then, you will select which form it inherits from.

"RandyR" wrote:

> I'm building a small desktop database app. I am building a template
> form that
> has navigation and editing coded, and want to inherit this for my
> actual data
> forms. When I add a form, and change the inherits statement to point to
> the
> form I want, as soon as I try to view it in the designer I get an
> error:
> Value can't be null. Parameter name: dataSource.
> It looks like the parameter for the binding manager, so I tried
> removing the
> reference in my template, and still get the error. I tried wrapping the
> bindingmanager = me.bindingcontext(dataSource) in a try statement, and
> that
> didn't help. I can't find any other place where a data source is
> referenced
> in the template. Ideas much appreciated.

[Cor Ligthert]

Randy,

That can be, I think that the best is to try to keep your binding inside
your template form or to keep it completly outside.

Cor

"RandyR" <rr*****@nospam.att.net>

I tried your suggestion, and still no success; could be I'm not placing
correctly. I added a form level variable in my base form set to false, and
at
the end of the initialize routine set it to true. In the form load, I set
the
binding manager; no joy. I also tried removing
manager=me.bindingcontext(MyData) before inheriting the form and no luck.
Could it be because I've got procedures that reference the binding
manager?
Thanks for your help.

"Cor Ligthert" wrote:

Randy,

The currencymanager fires often as well while initializing. So try to set
the code that uses binding inside a booleanswith what you set to true
when
the initializing is done. We see not much from your code, so this is only
a
big gues

I hope this helps?

Cor

"RandyR" <rr*****@nospam.att.net>

>I tried that, and get the same error. Thanks for the attempt.
>
> "EdB" wrote:
>
>> I think you're going about it in a manner not intended by Mr. Gates &
>> co.
>>
>> You have your base form. Then build your solution. Then, don't add a
>> Windows form, add an Inherited Form. Here, you will first Name your
>> new
>> form, then, you will select which form it inherits from.
>>
>> "RandyR" wrote:
>>
>> > I'm building a small desktop database app. I am building a template
>> > form that
>> > has navigation and editing coded, and want to inherit this for my
>> > actual data
>> > forms. When I add a form, and change the inherits statement to point
>> > to
>> > the
>> > form I want, as soon as I try to view it in the designer I get an
>> > error:
>> > Value can't be null. Parameter name: dataSource.
>> > It looks like the parameter for the binding manager, so I tried
>> > removing the
>> > reference in my template, and still get the error. I tried wrapping
>> > the
>> > bindingmanager = me.bindingcontext(dataSource) in a try statement,
>> > and
>> > that
>> > didn't help. I can't find any other place where a data source is
>> > referenced
>> > in the template. Ideas much appreciated.