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If the field is able to store NULL values, then you should also use the NULL in your insert statement:
insert into table (field, field, ...) values ('value', null, ...
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In the design of the Access database table in question, ensure that the field is set to 'Allow Zero Length' and that it is not 'Required'.
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Hello There,
I am developing a POS Application in vb.net and using Firebird 2.01 as Database. the only problem i have there is when the connections to Firebird increase...The Client Software starts FREEZING...mostly when updating a table [Stock]. Can anybody help.
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Sounds like the software is freezing because of issues with the DB. Perhaps if you do your updates on another thread, or get a better database ?
Christian Graus
Driven to the arms of OSX by Vista.
"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.
I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp
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Hi,
Please can you recommend good books about Ms Office add-in and specially excel add-in useing Visual Studio tools and others, and what is the best way to start in developing Ms office add-in. Thanks.
hawari
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On VB you must add the library of excell it will give you access to import every variable of excell functions, just google it on how adding it, its nit that difficult
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Hi,
if you're using the VSTO you should find plenty of examples here and in MSDN. Just use e.g. "VSTO Sample" as keywords for your search. VSTO also has a template for COM Add-Ins.
Without VSTO it's a pretty complex issue.
Regards
Michael
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Can someone explain how to develop a program that capture keystrokes and write them to a log file or text file? Like a keystroke monitor program.
Dushan Perera
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Key loggers are always suspicious. You purpose of developing one might or might not be an honest one.
And, DO NOT CROSS POST.
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It's always comforting to me that the people who want to write evil software, usually have no idea how to do it. Now, you may have a perfectly valid reason to write a keystroke logger, but that's not what people are going to think when you say it like that.
Christian Graus
Driven to the arms of OSX by Vista.
"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.
I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp
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Christian Graus wrote: It's always comforting to me that the people who want to write evil software, usually have no idea how to do it.
Unfortunately there will always be a few people who have both the desire and knowledge to do it. Luckily we're very unlikely to ever see any of them on CP.
There are three kinds of people in the world - those who can count and those who can't...
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well there's a method and its this
use asycgetkeyborardstate().its is an api
but almost all antiviruses are able to detect its use
so it will be impossible to use it for malicious purposes
TheMrProgrammer
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Is it possible to show the calendar screen of a DateTimePicker control by clicking an image instead of clicking the control's downward triangle? I cannot find a property from the class for showing the calender screen. please help. Thanks.
Eric H.
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AFAIK DateTimePicker exposes nothing about that down arrow. I can suggest either to go for a third party control or override OnPaint for the form and Paint an image on the down arrow.
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Thank you,
I will solve the problem by writting the following
DateTimePicker1.Select()
SendKeys.Send("%{DOWN}")
If other suggestion, please advise
Eric H.
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My bad. I thought you need to replace the down arrow of the datetimepicker with some other image. Your requirement seems different. Although, still not clear to me.
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I will try to be clearer.
When you click the DateTimePicker control, at run time, the calendar is popping-up, doesn't it?
What I needed, instead of clicking the DateTimePicker control to get this popup window, is to click on a button and to get the same screen.
My target was to put on a button an icon of calendar and when the user click the button he will get the popup screen.
I hope it was clear now.
Eric H.
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You can always build your own control/dialog, using MonthCalendar and pop that up in response to the button click.
Henry Minute
Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”
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Ok I'm kind of confused here. I have an imagelist that begins with one image that should stay. Other images are added and removed at runtime but this is where I'm having problems. It seems to always assign the image to the one before the correct one. I tried adding +/- 1 but it didn't do anything.
Have you tried the Krypton Toolkit? http://www.componentfactory.com/free-windows-forms-controls.php
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If you posted some code, we may be able to follow what you mean.
Christian Graus
Driven to the arms of OSX by Vista.
"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.
I can do things with my brain that I can't even google. I can flex the front part of my brain instantly anytime I want. It can be exhausting and it even causes me vision problems for some reason. - CaptainSeeSharp
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Hi
I am new in using vb.net 2005  and I am having some problems  .
I'm trying to use the class "thread" in my own class "station"
But my problem is that the class "thread" is a notinheritable class.
I found some solutions, using mastinherit but I did not understand how I can use it in my class.
can any one help me  ????
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Id a class is marked and not inheritable (sealed in C#) then you can't inherit form it. Your only bet would be to write a class that wraps the functionality of the class you need.
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what do you mean with wrap?
and how can I warp a class
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So my first question here is are you trying to just use a thread in your class or are you trying to create a new class that inherits from thread as a base. After re-reading your original question I am not quite sure.
To wrap a class all you do is create a new class that has the name you want, in this case for example 'MyThread'. Then in the constructor you create an instance of the class you wanted to inherit from. Your new class simply exposes all of the methods of the class you are wrapping, but also exposes some of the new methods or new functionality that you wanted to include.
Keep in mind that this is not true inheritance so you cannot rely on being able to use your new class as a drop in replacement for other methods that are coded to accept a thread class, but it gets you as close to what you want as you can get without being able to inherit.
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