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No, I am not doing any thing in OnClosing(). But what makes me crazy is everything else in the application works fine i.e. all the controls are responding as usual, I can open child forms etc. Only the appl cannot be closed.
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hi,
Try to use Application.Exit() method for closing the application
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S r e e j i t h N a i r
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hi,
If cnu is using somethred and it is not completed on the time of dispose then your will get a "Application Communication Error". Nothing else. So here we can't assume that this problem is because of thred.
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S r e e j i t h N a i r
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Like the others, I also think you have a dangleling thread somewhere. Make sure the thread can exit exit properly from its loop, or use the ThreadPool for "fire and forget" threaded ops.
Best bet lies here: As soon as it happens, break the debugger and inspect all running threads (and make sure u name your threads!).
HTH 
top secret xacc-ide 0.0.1
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Hi!
I've experienced a similar effect while experimenting with a docking framework and then, later, in one of my own programs as well.
IIRC, the effect was produced by removing a control from its parent form while this control had the focus.
I just tried it out, but can't reproduct the effect now. Might be due to .NET 1.1 or .NET 1.0 SP2 (I tried both runtime versions to no avail).
But I know the problem WAS in there because there still is a workaround in my code (an invisible button receiving focus (via this.ActiveControl=myButton) befor removal of child controls).
Are you removing controls at runtime?
mav
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Yes...I add and remove controls at run time...
Is this the problem ?? So, if I unselect the control (just in case it has the focus) before removing, can it solve the problem?
Cheers
CNU
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Most likely, yes.
Add an invisible button to your form and before calling myForm.Controls.Clear() or Remove() or RemoveAt() set the active control to this button: myForm.ActiveControl=invisButton.
I think this also is relevant when you're removing controls from panels on this form.
You can also try .NET Framework 1.0 ServicePack 2 or .NET 1.1.
mav
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Hi,
anybody knows how to convert .pwi to image?
is there any component available?
thanks 
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Pocket Word files 
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khchan wrote:
Pocket Word files
Ahh, sorry, the best I can think of it to use a digital camera 
top secret xacc-ide 0.0.1
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Greetings CP!
Well - it appears I've been presented with a roadblock and cant seem to find the problem.
Heres the situatio.
Ive created an app that has to scann 16000+ servers - for now - all that has to be done is connect and send and receive once asynchronously.
I am able to get the entire process down - the problem that occurs is that at random times the app just halts.
It just stops connecting to the servers - no exceptions thrown - no nada. Its not a threading problem - unless its a bug in the threadpooling for asychronous socket communications.
To draw out some broad strokes about the current scenario
Classes
MainForm applications main form
ConnectionState stores connection information
- buffer
- socket
- server hostname
- start time / end time / elapsed time
ConnectionManager this object is used in the main form (connection
state is not accessed directly)
- i start the process with a method called
CheckServers() which is passed to a ThreadStart object
in the main form for a Thread object named worker
- the worker thread is started and is set to a
background thread from the main form
MessageEventHandler a delegate used to pass the messages from the buffer
to controls on the main form
I know this is a somewhat complicated issue to deal with over these forums.. but - i have traced every aspect of my code - 2-3 days spent in the debugger watching everything and still no luck.
Any suggestions?
Danny!
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Are you setting off alarms at your ISP?
They may not like you accessing so many machines. It could be taken as a worm or a vulnerability test in preparation for a new virus etc.
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Hrmmm you know what - i didnt think about that..
Maybe I should put a delay between requests - like a random delay to see if that stops the problem..
Good idea!
Anymore suggestions?
Danny!
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Some how I dont think the .NET threadpool is gonna cut that
Some other suggestions:
- socket buffersizes and timeouts, by default they will wait for ever...
- Linger options
- Socket options (god knows what they all do....)
top secret xacc-ide 0.0.1
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leppie wrote:
Some how I dont think the .NET threadpool is gonna cut that
Well instead of using thread pools manually im using them by means of asynchronous communication. to my understand - when communicating asynchronously with sockets (i.e. BeginConnect EndConnect etc etc ) these mechanisms use threadpooling in the background.
Now it all depends on how you use these mechanism. For example - my first attempts maxed out the thread pools and i was only able to do 25 connections and blah - it got stuck there. I was able to by pass this with creating only 1 object that would do the main communication. Originally i had created an object which handled the entire connection including buffer / socket as well as the async parts. but for some nutty reason - this method did not prove to work - possible because garbage colleciton - although it was manually called - would not collect the lingering objects which were ready for collection..
leppie wrote:
- socket buffersizes and timeouts, by default they will wait for ever...
when it comes to this - during asynchronous communications the appropriate exceptions are thrown informing you of these.
leppie wrote:
- Linger options
- Socket options (god knows what they all do....)
well alas you have me at this one. right now im not using any socket options - since it seems to be working quite well without them..
ending comments...
i took the first suggestion and implemented a random wait interval between each connection to each server. this proved to work perfectly - since that post the application has gone through 4000 servers and its still going - which is by far - further than its gone before. i simply put in a random interval between 1 and 30 seconds. although its a trade off for now - in time - the production system wont have these restrictions (i.e. flood control or worm detection whatever they call it )
Again thanks all for the advice and comments.
Also - any more suggestions?
p.s. a word on asynchronous sockets...
ive test various methods of socket communication - async, sycn, manual thread pooling, custom threading... everything.. ive been able to achieve equal results if not better with the manual threading in comparison to asyhc mechanisms - but it was far trickier to achieve.
has anyone implemented a server app - web server? ftp server? irc serveR? anything with async sockets in c#? just curious about your results..
Danny!
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welp! it appears i spoke to soon - the app stopped working yet again - now its either my isp that keeps blocking or something else - i have resorted to fiddling with the socket options..
 lets see if this works out..
Danny!
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Danny Rodriguez wrote:
now its either my isp that keeps blocking or something else
Get a port sniffer/packet capture prog and see what happens! I suggest NGSniff + winpcap (only thing that didnt BSOD me).
I have a funny feeling something is wrong in the Sockets in .NET, other problems, but if there's one, there bound to be more!
I will look into those options and see what I can suggest. You definately want to turn lingering off.
Have you tried another threadpool implemeatation perhaps?
top secret xacc-ide 0.0.1
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Okay.. the ordeal continues..
I am still receiving the same problem..
Ive set sockets timeout via the SetSocketOptions but it appears to do nothing with asynchronous sockets.
so then i moved onto another solution - which was to create a new thread which would wiat for a certain time period to elapse.. once it does it would manually kill the socket. unfornately this did nothing..
also - i contact the isp and the are not doing anything so that idea is out the door..
any suggestions..
the basic problem is setting a timeout on a socket which is being use in async communications..
any suggestion. im starting to get disperate 
Danny!
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I need a treeview/listview type control that will allow me to use a
progressbar or another object in one of the columns. The layout I need will
look like below:
-----------------------------------------
User | File | Progress |
-----------------------------------------
user1 | file1.txt | ||||||| 2% |||||||||||
does anybody know of a control/component that will do this or how to go
about making/modifying one?
Thanks,
Aaron
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Bompus wrote:
does anybody know of a control/component that will do this or how to go
about making/modifying one?
I'm sure I have seen an article on this right here on CP a while back  (could be wrong!)
top secret xacc-ide 0.0.1
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there's a couple of owner drawn listviews right here on codeproject.com - glacial listview is probably what you need, or carlos' articles
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The primary key for table Attachment is AttachmentID. I wanted the file path to be unique,meaning if you have entered the repeated filepath,the system will pop up a error msg,and the file path record will be denied.
Here is the stored procedure with C#:
CREATE PROCEDURE FilePath
{
@AttachmentPath Varchar(50)
}
AS
Select AttachmentPath from Attachment where AttachmentPath=@AttachmentPath
IF @@ROWCOUNT = 0
BEGIN
INSERT INTO ATTACHMENT VALUES(@AttachmentPath)
END
RETURN @@ROWCOUNT
GO
It still can't work,why?Please help me!
Thank you!
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Make sure you have your AttachmentID column in Attachment Table set as Identity(autonumber)
CREATE TABLE [dbo].[Attachment] (
[AttachmentID] [int] IDENTITY (1, 1) NOT NULL ,
[AttachmentPath] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Attachment] ADD
CONSTRAINT [PK_Attachment] PRIMARY KEY CLUSTERED
(
[AttachmentID]
) ON [PRIMARY]
GO
Change Stored Procedure as
CREATE PROCEDURE FilePath
@AttachmentPath Varchar(50)
AS
Declare @count int
Select @count = count(*) from Attachment where AttachmentPath = @AttachmentPath
if @count =0
BEGIN
INSERT INTO ATTACHMENT(AttachmentPath) VALUES(@AttachmentPath)
END
GO
Note: An easiest way would be to have AttachementPath column set as Unique. Then, stored procedure would automatic generate an error in case of duplicate data
Sanjay Sansanwal
www.sansanwal.com
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Hello,
I'm building an application were I need to fill a large dataset before using it to display a crystal report. I has been taking up to 30 sec. to retrieve all the data from the server and I need a way to assure the user that the application has not froze up during this time. I cannot get a progress bar to work in this case and have also tried to display a form with an animated gif, but the gif does not animate during the data retrieval. I would like to be able to show the user a true progress if possible, any suggestions?
-Scott
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