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Hello,
I use VB.NET 2003 on Windows XP pro and .NET framework 1.1 SP1. VS2005 and .NET 2.0 are also installed.
I am using a combobox on a tabcontrol. When I select a value at runtime directly in the dropdown list of the combobox, it works normally. But it abnormally fires events (SelectionChangeCommitted, SelectedIndexChanged, SelectedValueChanged) when I use the scrollbar of the combobox : events get fired even if I have not selected anything, just after releasing the mouse button above the scrollbar. Then, the application runs into the dispose method of the form and complains about an unexisting instance addressed by reference, and exits on this bug. I observe this behaviour whether I bind it at runtime or I fill its rows at design time. I have tried to solve it and to work around this behaviour without success. Is this a known bug ? I have not found any report on such behaviour in .NET 1.1.
I would greatly appreciate help and explaination ! Thank you.
-- modified at 4:21 Wednesday 9th May, 2007
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Set AutoPostBack property of combobox as false
Regards,
Sylvester G
sylvester_g_m@yahoo.com
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No such property seems to be defined for combobox in .NET 1.1. Can you please precise your solution ? Thank you.
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hey its there...Open you eyes please check it closely
Regards,
Sylvester G
sylvester_g_m@yahoo.com
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This property looks to be available for web applications with ASP.NET. I am working on a desktop application written in VB.NET 2003 and no such property exists for combobox.
Furthermore, the problem I describe is really weird and inconsistant : events like SelectionChangedEvent get fired despite the fact that I do not select anything. I just release the mouse button above the combobox scrollbar, which should not fire such event as no selection was already made. I suspect something got wrong on my machine and I need to reinstall VS and .NET. I hope not. Has anyone a suggestion ?
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Yes, this is a peculiar problem which I've faced too. The event seems to fire when the control is initialized. I haven't really dug too deep into this, but one way to workaround this is to check for the SelectedIndex property. It's usually -1 or 0 when the event fires unwanted. Put your whole logic inside a if condition that checks for SelectedIndex > 0.
Regards,
SG
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Thank you for your answer.
This is a bugging code sample :
Dim DV As DataView<br />
Dim DVRow As DataRowView<br />
<br />
DV = ADO_BDGlobale.Tables(NOM_TBL_Enseigne).DefaultView<br />
DVRow = DV.AddNew<br />
DVRow("Libelle_Long") = " Toutes les enseignes"<br />
DVRow("Cod_Enseigne") = 0<br />
DV.Sort = "Cod_Enseigne"<br />
Me.ComboBox_PanelPV_Enseigne.DisplayMember = "Libelle_Long"<br />
Me.ComboBox_PanelPV_Enseigne.ValueMember = "Cod_Enseigne"<br />
Me.ComboBox_PanelPV_Enseigne.DataSource = DV<br />
1) The bug described before occurs (abnormal events during interaction with scrollbar)
2) The combobox item list does not get sorted first  . After a few selections without the scrollbar, the combobox item list finally gets sorted ( !!!).
This is another simplified bugging code sample :
DV = ADO_BDGlobale.Tables(NOM_TBL_Enseigne).DefaultView<br />
Me.ComboBox_PanelPV_Enseigne.DisplayMember = "Libelle_Long"<br />
Me.ComboBox_PanelPV_Enseigne.ValueMember = "Cod_Enseigne"<br />
Me.ComboBox_PanelPV_Enseigne.DataSource = DV<br />
Binding to a dataview or a datatable, and no element at index 0, the event bug occurs with the scrollbar when it is scrolled until the end of the list.
The case looks desperate... 
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The workaround you posted does not solve the problem for me. SelectedIndex is not set to a negative or null value when the abnormal event arises.
How shall I report this bug to Microsoft ?
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I've been looking at the configuration class and the connectionsettings property and have noticed that when I look at the zeroth element in the collection and then do a .name on it I get back something like "LocalSqlServer". I then get "data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" as the connection string value.
Is this some sort of default given automatically as part of this property or is it getting something from off my development machine?
Thanks.
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VS.NET installation also installs the Express edition of SQL Server. If this is not true in your case, it's probably the ASP.NET User and Role management DB, guessing by the DB Name. You'll find the mdf in your App_Code directory.
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That's also what I'm guessing, so I'm going to try it on a nondevelopment machine to find out.
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Here's a new wrinkle... I put the code on a non dev machine and get the same results. Does anyone have any explaination to this behavior, because the only conclusion I can come to is that it's some kind of default?
Thanks.
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Look in your web.config file. You'll find the "default" value in there.
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There isn't any file. This is what happens when I just instantiate a configuration class object and then do an OpenExeConfiguration and specify a path. The HasFile property is set to false, which it should, since there isn't actually a file, but that this is all in memory. When I save the configuration it puts no connectionsettings section in the config file.
When I add a new setting on my own and then save it, it then saves only my setting and ignores the "default" setting. Is there a base config file someplace I should be looking at that settings are getting incorporated from also? This isn't a web application, but a workstation app.
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OK. If there isn't any file, why are you using the ConfigurationManager??
There IS a default inherited ConnectionStringSetting in the ConfigurationManager, regardless if there is a config file or not. This is comming from the machine.config and machine.default files in C:\WINDOWS\Microsoft.NET\Framework\<version>\CONFIG.
To tell your COnfigurationManager to forget about the inherited connectionstrings, create a config file in your app and add your connection string like this:
<?xml version="1.0" encoding="utf-8" ?>
.
. blah, blah, blah...
.
<connectionStrings>
<clear/>
<add name="myConnectiongStringName" providerName="System.Data.SqlClient" connectionString= "blah;blah;blah;" />
</connectionStrings>
The clear/ line will tell the ConfigurationManager to dump all of the ConnectionStringSetting boject it currently has, including the default one, and build a new collection from the rest of the connectionStrings section.
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I was using the ability of the save method in the configuration class to save the memory version to file. The exmples I've seen use the configurationmanager to get the object of the configuration class since it has no constructors. If there is another method for getting a configuration class instance I'd certainly like to know about it.
Well, the machine.config file certainly explains it then.
Thanks
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Thanks! I didn't know about this.
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That setting should be in the machine.config file or the root web.config file in the framework directory.
Look in c:\windows\microsoft.net\framework\"pick your framework version"\configuration
Hope that helps.
Ben
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My setup project is already installed on my system.I am rebuilding it without doing any modification.If I double clicks my installer package it shows the message that "some version of product is already there".
What can be the issue?
Actually I am installing some some project output files through this setup project. I just want to install the output files which i have updated.It is of no use to uninstall full project and again install it.
Is it possible to customize my progress dialog box in userinterface Editor.I need the functionality at installation time that shows which component is getting installed at that particular time.I want to display some label on progress dialog box which will show that information.I am not finding any property like that with dialog box.
Thanks in advance,
Mann
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can anyone recommend a book(s) that provides in depth coverage of .NET components, service providers etc. Preferably one that move beyond the developers perspective, i.e. recognises that folks in banks, hospitals etc, don't use an IDE to manage loans or schedule surgical staff rosters.
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Hi
I am trying to index folders that are located in network in the MS Indeing server in ASP.Net c#. But when i call the method AddScope() providing the sharename ,folder path and the credentials it gives following exception:
System.Runtime.InteropServices.COMException (0x8004160A): Exception from HRESULT: 0x8004160A
at CIODMLib.ICatAdm.AddScope(String bstrScopeName, Boolean fExclude, Object vtLogon, Object vtPassword)
could you please tell what this exception about and how can i remove this to attain the desired functionality.
-- modified at 4:04 Wednesday 9th May, 2007
Manoj Kaushik
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Can anyone tell me if Thread.Sleep releases the thread to process other requests? Or does it hold that thread up until it re-activates.
I read somewhere it frees the processor for other things, but can't remember for the life of me where.
Cheers
Tris
-------------------------------
Carrier Bags - 21st Century Tumbleweed.
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Thread.Sleep() blocks the current thread, so that cannot do any more processing for the specified time period, however due to the windows process scheduler other threads keep running (it doesn't hang the whole PC).
Wilco
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Hi Wilco, thanks.
I know the thread is 'blocked' but does the CLR scheduler move the resources from that thread to another one to allow another thread to continue in place of the one that has just been blocked.
The reason i ask is that i'd like to use the Async DbExecute method with Thread.Sleep, but it would be completely pointless if it doesn't allow the underlying processor time to switch in the background to another thread for the duration of the sleep.
Cheers
T
-------------------------------
Carrier Bags - 21st Century Tumbleweed.
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it hold that thread up until it re-activates
either in win or web
already in web the processor works parellarly with all client requests
it works in one page for a while and for example opens the DB connection and waiting data back in that stage it goes to another page and work and then get back to the first to continue when the databack then finish and goes to the second page to continue
this is more advanced technique than thread stop
the iis server who evaluates at which stage of code the processor can go to work in another page
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