'HtmlTextWriter' cannot be converted to 'HtmlTextWriter'.

[Blaz Ziherl]

Hi,

I am developing an application in VisualBasic .NET and got the
following error:

"An unhandled exception of type 'System.Invalid CastException' occurred
in microsoft.visua lbasic.dll

Additional information: Argument 1 to method 'Control.Render Control'
has type 'HtmlTextWriter ' and cannot be converted to
'HtmlTextWriter '."

I am a newby to .NET, but this sounds a bit stupid to me. However, I
am also posting problematic part of the code where the error occurs:

Dim targetObj As New Object()
Dim sw As New StringWriter()
Dim tw As New System.Web.UI.H tmlTextWriter(s w)
targetObj = a.CreateInstanc e(aT.FullName)
targetObj.Rende rControl(tw) <--- here's the problem!
MsgBox(sw.ToStr ing())

Hopefuly someone will have an idea what's wrong.
Blaz Ziherl
blaz.ziherl@abr axas.si

[Ed Kaim [MSFT]]

Re: 'HtmlTextWriter ' cannot be converted to 'HtmlTextWriter '.

Where are you initializing a and aT? If aT doesn't point to a valid type it
could be the problem.

"Blaz Ziherl" <blaz.ziherl@ab raxas.si> wrote in message
news:9d318fd9.0 401020408.5da6c 6a0@posting.goo gle.com...[color=blue]
> Hi,
>
> I am developing an application in VisualBasic .NET and got the
> following error:
>
> "An unhandled exception of type 'System.Invalid CastException' occurred
> in microsoft.visua lbasic.dll
>
> Additional information: Argument 1 to method 'Control.Render Control'
> has type 'HtmlTextWriter ' and cannot be converted to
> 'HtmlTextWriter '."
>
> I am a newby to .NET, but this sounds a bit stupid to me. However, I
> am also posting problematic part of the code where the error occurs:
>
> Dim targetObj As New Object()
> Dim sw As New StringWriter()
> Dim tw As New System.Web.UI.H tmlTextWriter(s w)
> targetObj = a.CreateInstanc e(aT.FullName)
> targetObj.Rende rControl(tw) <--- here's the problem!
> MsgBox(sw.ToStr ing())
>
> Hopefuly someone will have an idea what's wrong.
> Blaz Ziherl
> blaz.ziherl@abr axas.si[/color]

[Blaz Ziherl]

Re: 'HtmlTextWriter ' cannot be converted to 'HtmlTextWriter '.

Here's the declaration code for a and aT:

Dim a As [Assembly] =
[Assembly].LoadFrom("file ://c:/windows/microsoft.net/framework/v1.1.4322/system.web.dll" )

Dim aTypes As Type() = a.GetTypes()
Dim aT As Type
For Each aT In aTypes
...
Next

I hope you will see any possible problems here...if not, I can post
the whole code.

Blaz


"Ed Kaim [MSFT]" <edkaim@online. microsoft.com> wrote in message news:<uhYi$ue0D HA.2676@tk2msft ngp13.phx.gbl>. ..[color=blue]
> Where are you initializing a and aT? If aT doesn't point to a valid type it
> could be the problem.
>
> "Blaz Ziherl" <blaz.ziherl@ab raxas.si> wrote in message
> news:9d318fd9.0 401020408.5da6c 6a0@posting.goo gle.com...[color=green]
> > Hi,
> >
> > I am developing an application in VisualBasic .NET and got the
> > following error:
> >
> > "An unhandled exception of type 'System.Invalid CastException' occurred
> > in microsoft.visua lbasic.dll
> >
> > Additional information: Argument 1 to method 'Control.Render Control'
> > has type 'HtmlTextWriter ' and cannot be converted to
> > 'HtmlTextWriter '."
> >
> > I am a newby to .NET, but this sounds a bit stupid to me. However, I
> > am also posting problematic part of the code where the error occurs:
> >
> > Dim targetObj As New Object()
> > Dim sw As New StringWriter()
> > Dim tw As New System.Web.UI.H tmlTextWriter(s w)
> > targetObj = a.CreateInstanc e(aT.FullName)
> > targetObj.Rende rControl(tw) <--- here's the problem!
> > MsgBox(sw.ToStr ing())
> >
> > Hopefuly someone will have an idea what's wrong.
> > Blaz Ziherl
> > blaz.ziherl@abr axas.si[/color][/color]

[Jon Skeet [C# MVP]]

Re: 'HtmlTextWriter ' cannot be converted to 'HtmlTextWriter '.

Blaz Ziherl <blaz.ziherl@ab raxas.si> wrote:[color=blue]
> Here's the declaration code for a and aT:
>
> Dim a As [Assembly] =
> [Assembly].LoadFrom("file ://c:/windows/microsoft.net/
> framework/v1.1.4322/system.web.dll" )
>
> Dim aTypes As Type() = a.GetTypes()
> Dim aT As Type
> For Each aT In aTypes
> ...
> Next[/color]

Ah - in that case the problem is that you've got two different
Assemblies loaded into your AppDomain - the one loaded automatically
and the one you specifically loaded. It's essentially the same problem
as the one explained here:

http://www.pobox.com/~skeet/csharp/plugin.html

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Blaz Ziherl]

Re: 'HtmlTextWriter ' cannot be converted to 'HtmlTextWriter '.

Aha, now at least I know what's the problem. But I am not quite sure I
know how to solve it, LOL. Please note, that I am a .NET newby...so...

Thanks, Blaz

ps: I thought Microsoft came up with Visual Basic because they wanted
to create an easy to use development tool......it's becoming
everything but that, LOL! Visual Basic just ain't that basic anymore
;)