Random Crash in my .NET Program

[Renzska]

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song completes
I set the selected item in the listbox. I am assuming that is has to do with
the listbox because of this line:

"at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"

and the listbox is the only part of my program that has a scrollable control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullReferenceException: Object reference not set to an instance of an
object.

at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)

at System.Windows.Forms.Control.DefWndProc(Message& m)

at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)

at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)

at System.Windows.Forms.ParkingWindow.WndProc(Message & m)

at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)

at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

[Sebastian Dau]

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:E4**********************************@microsof t.com...

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullReferenceException: Object reference not set to an instance of
an
object.

at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)

at System.Windows.Forms.Control.DefWndProc(Message& m)

at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)

at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)

at System.Windows.Forms.ParkingWindow.WndProc(Message & m)

at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)

at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

[Sebastian Dau]

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:E4**********************************@microsof t.com...

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullReferenceException: Object reference not set to an instance of
an
object.

at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)

at System.Windows.Forms.Control.DefWndProc(Message& m)

at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)

at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)

at System.Windows.Forms.ParkingWindow.WndProc(Message & m)

at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)

at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

[Renzska]

public void setSelected(int track)
{
listFormPlayList.SetSelected(track, true);
}

That is what I am doing. But I call it in a lot of different places. Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:E4**********************************@microsof t.com...

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullReferenceException: Object reference not set to an instance of
an
object.

at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)

at System.Windows.Forms.Control.DefWndProc(Message& m)

at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)

at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)

at System.Windows.Forms.ParkingWindow.WndProc(Message & m)

at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)

at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

[Renzska]

public void setSelected(int track)
{
listFormPlayList.SetSelected(track, true);
}

That is what I am doing. But I call it in a lot of different places. Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:E4**********************************@microsof t.com...

I am getting a random crash in my program. I think it has to do with the
only listbox I have. It uses the WMP to play songs and when a song
completes
I set the selected item in the listbox. I am assuming that is has to do
with
the listbox because of this line:

"at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"

and the listbox is the only part of my program that has a scrollable
control.
Any help in fixing this would be greatly appreciated.

Here is the debug info:

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.NullReferenceException: Object reference not set to an instance of
an
object.

at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)

at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)

at System.Windows.Forms.Control.DefWndProc(Message& m)

at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)

at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)

at System.Windows.Forms.ParkingWindow.WndProc(Message & m)

at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)

at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)
Thanks,

Renzska

[Sebastian Dau]

Hello,

NullReferenceExceptions in this native methods mostly happen
when own code mixes something up while running inside
of the native window thread.

Are your sure that track in your method call

listFormPlayList.SetSelected(track, true);

is not set to some value out of range?
Greets, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:DF**********************************@microsof t.com...

public void setSelected(int track)
{
listFormPlayList.SetSelected(track, true);
}

That is what I am doing. But I call it in a lot of different places.
Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:E4**********************************@microsof t.com...

>I am getting a random crash in my program. I think it has to do with
>the
> only listbox I have. It uses the WMP to play songs and when a song
> completes
> I set the selected item in the listbox. I am assuming that is has to
> do
> with
> the listbox because of this line:
>
> "at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"
>
> and the listbox is the only part of my program that has a scrollable
> control.
>
>
> Any help in fixing this would be greatly appreciated.
>
> Here is the debug info:
>
> See the end of this message for details on invoking
>
> just-in-time (JIT) debugging instead of this dialog box.
>
>
>
> ************** Exception Text **************
>
> System.NullReferenceException: Object reference not set to an instance
> of
> an
> object.
>
> at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
> wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
>
> at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)
>
> at System.Windows.Forms.Control.DefWndProc(Message& m)
>
> at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)
>
> at System.Windows.Forms.Control.WndProc(Message& m)
>
> at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
>
> at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
>
> at System.Windows.Forms.ParkingWindow.WndProc(Message & m)
>
> at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
>
> at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
>
> at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
> IntPtr wparam, IntPtr lparam)
>
>
> Thanks,
>
> Renzska
>

[Renzska]

Shouldn't be, but I'll check it out just to make sure.

Thanks,

Renzska

"Sebastian Dau" wrote:

Hello,

NullReferenceExceptions in this native methods mostly happen
when own code mixes something up while running inside
of the native window thread.

Are your sure that track in your method call

listFormPlayList.SetSelected(track, true);

is not set to some value out of range?
Greets, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:DF**********************************@microsof t.com...

public void setSelected(int track)
{
listFormPlayList.SetSelected(track, true);
}

That is what I am doing. But I call it in a lot of different places.
Could
that be the cause of my problem?

Thanks,

Renzska

"Sebastian Dau" wrote:

Could you provide some sample code?

Thanks, Sebastian Dau

"Renzska" <Re*****@discussions.microsoft.com> wrote in message
news:E4**********************************@microsof t.com...
>I am getting a random crash in my program. I think it has to do with
>the
> only listbox I have. It uses the WMP to play songs and when a song
> completes
> I set the selected item in the listbox. I am assuming that is has to
> do
> with
> the listbox because of this line:
>
> "at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)"
>
> and the listbox is the only part of my program that has a scrollable
> control.
>
>
> Any help in fixing this would be greatly appreciated.
>
> Here is the debug info:
>
> See the end of this message for details on invoking
>
> just-in-time (JIT) debugging instead of this dialog box.
>
>
>
> ************** Exception Text **************
>
> System.NullReferenceException: Object reference not set to an instance
> of
> an
> object.
>
> at System.Windows.Forms.UnsafeNativeMethods.CallWindo wProc(IntPtr
> wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
>
> at System.Windows.Forms.NativeWindow.DefWndProc(Messa ge& m)
>
> at System.Windows.Forms.Control.DefWndProc(Message& m)
>
> at System.Windows.Forms.Control.WmUpdateUIState(Messa ge& m)
>
> at System.Windows.Forms.Control.WndProc(Message& m)
>
> at System.Windows.Forms.ScrollableControl.WndProc(Mes sage& m)
>
> at System.Windows.Forms.ContainerControl.WndProc(Mess age& m)
>
> at System.Windows.Forms.ParkingWindow.WndProc(Message & m)
>
> at System.Windows.Forms.ControlNativeWindow.OnMessage (Message& m)
>
> at System.Windows.Forms.ControlNativeWindow.WndProc(M essage& m)
>
> at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
> IntPtr wparam, IntPtr lparam)
>
>
> Thanks,
>
> Renzska
>