'System.NullReferenceException' occurred in system.windows.forms.d

G

Guest

i have a windows form(Main) with listview, when click an item in listview i
open other window form (Sub) which generate the selected item from parent
window in as treeview items when click any item in treeview i display the
content item in axWebBrowser, i close the sub form normally when i close the
main the following error is generated

An unhandled exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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

i tried to trace the closing event in my application there is no exeception,
so im confused what causing this problem?
 
G

Guest

a full detailed error:


An unhandled exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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


An unhandled exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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

Unhandled Exception: System.NullReferenceException: Object reference not set
to an instance of an object.
at System.Windows.Forms.IConnectionPoint.Unadvise(Int32 cookie)
at System.Windows.Forms.ConnectionPointCookie.Disconnect()
at System.Windows.Forms.ConnectionPointCookie.Finalize()An unhandled
exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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


Unhandled Exception: System.NullReferenceException: Object reference not set
to an instance of an object.
at System.Windows.Forms.IConnectionPoint.Unadvise(Int32 cookie)
at System.Windows.Forms.ConnectionPointCookie.Disconnect()
at System.Windows.Forms.ConnectionPointCookie.Finalize()
Unhandled Exception: System.NullReferenceException: Object reference not set
to an instance of an object.
at System.Windows.Forms.IConnectionPoint.Unadvise(Int32 cookie)
at System.Windows.Forms.ConnectionPointCookie.Disconnect()
at System.Windows.Forms.OleInterfaces.StopEvents()
at System.Windows.Forms.OleInterfaces.Finalize()The program '[2708]
Viewer.exe' has exited with code 0 (0x0).
 
I

Ignacio Machin \( .NET/ C# MVP \)

Hi,

Can you post some code?
Also are you using something especial in your form? any third party
controls,etc?

the trace you are getting are all members of the framework, I do not see any
members from your class.


cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

Raed Sawalha said:
a full detailed error:


An unhandled exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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


An unhandled exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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

Unhandled Exception: System.NullReferenceException: Object reference not
set
to an instance of an object.
at System.Windows.Forms.IConnectionPoint.Unadvise(Int32 cookie)
at System.Windows.Forms.ConnectionPointCookie.Disconnect()
at System.Windows.Forms.ConnectionPointCookie.Finalize()An unhandled
exception of type 'System.NullReferenceException' occurred in
system.windows.forms.dll

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


Unhandled Exception: System.NullReferenceException: Object reference not
set
to an instance of an object.
at System.Windows.Forms.IConnectionPoint.Unadvise(Int32 cookie)
at System.Windows.Forms.ConnectionPointCookie.Disconnect()
at System.Windows.Forms.ConnectionPointCookie.Finalize()
Unhandled Exception: System.NullReferenceException: Object reference not
set
to an instance of an object.
at System.Windows.Forms.IConnectionPoint.Unadvise(Int32 cookie)
at System.Windows.Forms.ConnectionPointCookie.Disconnect()
at System.Windows.Forms.OleInterfaces.StopEvents()
at System.Windows.Forms.OleInterfaces.Finalize()The program '[2708]
Viewer.exe' has exited with code 0 (0x0).


Raed Sawalha said:
i have a windows form(Main) with listview, when click an item in listview
i
open other window form (Sub) which generate the selected item from parent
window in as treeview items when click any item in treeview i display the
content item in axWebBrowser, i close the sub form normally when i close
the
main the following error is generated

An unhandled exception of type 'System.NullReferenceException' occurred
in
system.windows.forms.dll

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

i tried to trace the closing event in my application there is no
exeception,
so im confused what causing this problem?
Click to expand...
Click to expand...
 

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