Object reference not set to an instance of an object (PDF Reader O

[Andy A38]

I have placed an ActiveX PDF control (the Adobe Reader OCX) on a .Net Windows
form and manually set the "src" property to "c:\myfolder\12 34.PDF". The
control displays this file when the application is run. So far so good.

However, when I add a button to change the src file (to be displayed) with a
single line of code in the button click event as shown below:

AxPdf1.src = "c:\myfolder\12 35.PDF"

....I get the following error:

An unhandled exception of type 'System.NullRef erenceException ' occurred in
mscorlib.dll

Additional information: Object reference not set to an instance of an object.


So what am I doing wrong?


--
Andy, MCDBA

[Chris, Master of All Things Insignificant]

Re: Object reference not set to an instance of an object (PDF Reader O

If you look in debug you will probably notice that AxPdf1 is set to a value
of nothing. You need to instantiate it with a line like
AxPdf1 = New ........ Normally this is taken care of by placing the OCX on
the form. Step through the code to see if it ever has a value and if it
loses it somewhere.

Hope this helps some.
Chris




"Andy A38" <AndyA38@discus sions.microsoft .com> wrote in message
news:FFCF650A-C554-4763-B919-230FA91D47ED@mi crosoft.com...[color=blue]
>I have placed an ActiveX PDF control (the Adobe Reader OCX) on a .Net
>Windows
> form and manually set the "src" property to "c:\myfolder\12 34.PDF". The
> control displays this file when the application is run. So far so good.
>
> However, when I add a button to change the src file (to be displayed) with
> a
> single line of code in the button click event as shown below:
>
> AxPdf1.src = "c:\myfolder\12 35.PDF"
>
> ...I get the following error:
>
> An unhandled exception of type 'System.NullRef erenceException ' occurred in
> mscorlib.dll
>
> Additional information: Object reference not set to an instance of an
> object.
>
>
> So what am I doing wrong?
>
>
> --
> Andy, MCDBA[/color]