Form won't display in design mode - Object reference not set

[Jeff Molby]

I'm quite experienced with ASP.Net, so I know the language pretty well, but
this is my first significant windows app in VB.Net, so I haven't encountered
many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I
cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being involved,
but I haven't found anything helpful.

Anyone come across this? Let me know what code might be helpful and I'll
post it.

BTW, it inherits from a base form that I created to house some standard
routines.

Thanks for any and all help!

[Cor]

Hi Jeff,

I was thinking and thinking about what would be the problem, but I think I
got it. You are used to a seperate form and code. In windows form the code
and the page are the same. Not y.aspx and y.vb but only x.vb.

So push on that form.vb in the solution explorer and the windowform should
show up. (When you set the solution explorer to show all files you will see
behind the x.vb a x.resx, when you take it not to strict you can compare
that with the x.aspx)

The load event works almost the same as with a webform, but there is of
course no "ispostback".

Cor

I'm quite experienced with ASP.Net, so I know the language pretty well, but this is my first significant windows app in VB.Net, so I haven't encountered many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being involved,
but I haven't found anything helpful.

[Herfried K. Wagner [MVP]]

* "Jeff Molby" <JeffMolby@C_mc_st.n_t> scripsit:

I'm quite experienced with ASP.Net, so I know the language pretty well, but
this is my first significant windows app in VB.Net, so I haven't encountered
many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I
cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being involved,
but I haven't found anything helpful.

Anyone come across this? Let me know what code might be helpful and I'll
post it.

BTW, it inherits from a base form that I created to house some standard
routines.

If it's not too much code, you may post the code of your form.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Jeff Molby]

It is all in one file, I guess I'm just using the wrong terminology. "Design
View" and "Code View" would probably be more appropriate, right?

"Cor" <no*@non.com> wrote in message
news:%2****************@TK2MSFTNGP09.phx.gbl...

Hi Jeff,

I was thinking and thinking about what would be the problem, but I think I
got it. You are used to a seperate form and code. In windows form the code
and the page are the same. Not y.aspx and y.vb but only x.vb.

So push on that form.vb in the solution explorer and the windowform should show up. (When you set the solution explorer to show all files you will see behind the x.vb a x.resx, when you take it not to strict you can compare
that with the x.aspx)

The load event works almost the same as with a webform, but there is of
course no "ispostback".

Cor

I'm quite experienced with ASP.Net, so I know the language pretty well, but

this is my first significant windows app in VB.Net, so I haven't

encountered

many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I

cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being

involved, but I haven't found anything helpful.

[Jeff Molby]

there is quite a bit of code, but I will post the Load event from both
forms.

Here is the link that got me thinking it might involve the Load event
http://www.dotnet247.com/247referenc...21/109402.aspx

Private Sub frmInventory_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Dim uom As InventoryBO.UnitsOfMeasurement
Dim vend As InventoryBO.Vendors

uom = New UnitsOfMeasurement
With uom
.ConnectionString = CONNECT_STRING
.SelectFilter = InventoryDC.UnitsOfMeasurementDC.SelectFilters.Lis tBox
.OrderByFilter =
InventoryDC.UnitsOfMeasurementDC.OrderByFilters.De scription
.Open()
End With

Me.cbxSalesUOM.SetDataSource(uom)
Me.cbxPurchaseUOM.SetDataSource(uom)
uom = Nothing
vend = New Vendors
With vend
.ConnectionString = CONNECT_STRING
.SelectFilter = InventoryDC.VendorsDC.SelectFilters.ListBox
.OrderByFilter = InventoryDC.VendorsDC.OrderByFilters.Name
.Open()
End With

Me.cbxVendorNumPri.SetDataSource(vend)
vend = Nothing
End Sub
Private Sub frmDataClassBase_Load(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles MyBase.Load
Dim dc As PDSADAL.IPDSADataClassRW
Dim arg As New DataFormCurrentRecordEventArgs
Dim dt As PDSADAL.TableData

RaiseEvent GetTables()
RaiseEvent GetLookups()

For Each dt In hshTables
Call DisplayRecord(dt)
Next
End Sub

"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:bp*************@ID-208219.news.uni-berlin.de...

* "Jeff Molby" <JeffMolby@C_mc_st.n_t> scripsit:

I'm quite experienced with ASP.Net, so I know the language pretty well, but this is my first significant windows app in VB.Net, so I haven't encountered many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being involved, but I haven't found anything helpful.

Anyone come across this? Let me know what code might be helpful and I'll
post it.

BTW, it inherits from a base form that I created to house some standard
routines.

If it's not too much code, you may post the code of your form.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Chris Dunaway]

On Thu, 20 Nov 2003 14:27:14 -0500, Jeff Molby wrote:
When you get the error, do you get a big red X across the form designer?
--
Chris

To send me an E-mail, remove the underscores and lunchmeat from my E-Mail
address.

[Jeff Molby]

Yup

"Chris Dunaway" <dunawayc@_lunchmeat_sbcglobal.net> wrote in message
news:1b***************************@40tude.net...

On Thu, 20 Nov 2003 14:27:14 -0500, Jeff Molby wrote:
When you get the error, do you get a big red X across the form designer?
--
Chris

To send me an E-mail, remove the underscores and lunchmeat from my E-Mail
address.

[Chris Dunaway]

On Fri, 21 Nov 2003 08:50:56 -0500, Jeff Molby wrote:

When you get the error, do you get a big red X across the form designer?

Yup

I get a similar problem on a new install of VS.Net 2003. ON any project
when I attempt to open the form designer, I get the big red X and a
NullReferenceException. I can add controls etc. to the form through code
and the program will run just fine, I just can use the designer.

So far, no one has offered any possible causes (or solutions). If I could
determine what the NullReferenceException was occuring on, it might help,
but I cannot.

Alas!

--
Chris

To send me an E-mail, remove the underscores and lunchmeat from my E-Mail
address.

[Jeff Molby]

Even on new blank forms? That's strange. VS03 has worked fine for me up
until the other day. The other forms in the project still work fine. It's
just this one that's giving me fits.
"Chris Dunaway" <dunawayc@_lunchmeat_sbcglobal.net> wrote in message
news:2m****************************@40tude.net...

On Fri, 21 Nov 2003 08:50:56 -0500, Jeff Molby wrote:

When you get the error, do you get a big red X across the form designer?

Yup

I get a similar problem on a new install of VS.Net 2003. ON any project
when I attempt to open the form designer, I get the big red X and a
NullReferenceException. I can add controls etc. to the form through code
and the program will run just fine, I just can use the designer.

So far, no one has offered any possible causes (or solutions). If I could
determine what the NullReferenceException was occuring on, it might help,
but I cannot.

Alas!

--
Chris

To send me an E-mail, remove the underscores and lunchmeat from my E-Mail
address.

[Jeff Molby]

I have no idea what I did to fix it. Oh well...

"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:bp*************@ID-208219.news.uni-berlin.de...

* "Jeff Molby" <JeffMolby@C_mc_st.n_t> scripsit:

I'm quite experienced with ASP.Net, so I know the language pretty well, but this is my first significant windows app in VB.Net, so I haven't encountered many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being involved, but I haven't found anything helpful.

Anyone come across this? Let me know what code might be helpful and I'll
post it.

BTW, it inherits from a base form that I created to house some standard
routines.

If it's not too much code, you may post the code of your form.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Cor]

Hi Jeff,

That is often with that error (I understood what it was when I saw it about
that cross).
Sometimes you only have to restart for that.

But I am glad you tell it to us, because I was looking for a solution for
you.

Cor

"Jeff Molby" <JeffMolby@C_mc_st.n_t> schreef in bericht
news:OA**************@TK2MSFTNGP12.phx.gbl...

I have no idea what I did to fix it. Oh well...

"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:bp*************@ID-208219.news.uni-berlin.de...

* "Jeff Molby" <JeffMolby@C_mc_st.n_t> scripsit:

I'm quite experienced with ASP.Net, so I know the language pretty well,

but

this is my first significant windows app in VB.Net, so I haven't encountered many of the quirks yet. I'm using VB 2003.

The form in question compiles perfectly and the application runs. However, I cannot view the design page of the form, only the code page. This just
cropped up today. I've heard rumors of the Form_Load event being involved, but I haven't found anything helpful.

Anyone come across this? Let me know what code might be helpful and

I'll post it.

BTW, it inherits from a base form that I created to house some standard routines.

If it's not too much code, you may post the code of your form.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Cor]

Hi Jeff,

Now I know what it was,
just unselect it from your IDE and select it again in your solution
explorer.

(for the next time)

:-)

Cor

[Jeff Molby]

I give up... everything works fine, so I'll just workaround it. I'm sure
it'll start working again before long.
"Cor" <no*@non.com> wrote in message
news:Oj**************@tk2msftngp13.phx.gbl...

Hi Jeff,

That is often with that error (I understood what it was when I saw it about that cross).
Sometimes you only have to restart for that.

But I am glad you tell it to us, because I was looking for a solution for
you.

Cor

"Jeff Molby" <JeffMolby@C_mc_st.n_t> schreef in bericht
news:OA**************@TK2MSFTNGP12.phx.gbl...

I have no idea what I did to fix it. Oh well...

"Herfried K. Wagner [MVP]" <hi***************@gmx.at> wrote in message
news:bp*************@ID-208219.news.uni-berlin.de...

* "Jeff Molby" <JeffMolby@C_mc_st.n_t> scripsit:
> I'm quite experienced with ASP.Net, so I know the language pretty well,

but

> this is my first significant windows app in VB.Net, so I haven't

encountered

> many of the quirks yet. I'm using VB 2003.
>
> The form in question compiles perfectly and the application runs.

However, I

> cannot view the design page of the form, only the code page. This just > cropped up today. I've heard rumors of the Form_Load event being

involved,

> but I haven't found anything helpful.
>
> Anyone come across this? Let me know what code might be helpful and

I'll > post it.
>
> BTW, it inherits from a base form that I created to house some standard > routines.

If it's not too much code, you may post the code of your form.

--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>

[Jeff Molby]

Didn't help :-(

"Cor" <no*@non.com> wrote in message
news:ek**************@TK2MSFTNGP10.phx.gbl...

Hi Jeff,

Now I know what it was,
just unselect it from your IDE and select it again in your solution
explorer.

(for the next time)

:-)

Cor