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But you do need to read the instructions for your scanner and find out what protocol is used to talk to it. I think you can access the I/O ports direct from .Net without P/Invoke these days but you still need to know what is being said.
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First step would be to actually investigate bar code readers.
And just to be sure you are not presuming that you can write code that will work with any reader without actually testing it right?
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Hello: I am from the country and English is very good, I have a project in C # you can do video conferencing with your help.
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Try using Google to get the information you need, it's unlikely that anyone will be able to provide a full solution for you.
The best things in life are not things.
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I need to implement a schedule-based process using a CRON. Anyone know of a function or any code where I can pass in a CRON and get back a bool if it's time to run?
Everything makes sense in someone's mind
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What's a cron? Isn't that a drug reference? 
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A Cron job is for UNIX a backup job
In Word you can only store 2 bytes. That is why I use Writer.
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cron is actually a simple command scheduler in *nix systems. It's configured via a crontab file that specifies intervals and commands to be run (among other things). It's commonly used for doing tasks like backup routines, rolling over logfiles, and other maintenance.
The Windows equivalent would be the Task Scheduler.
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Why exactly do you think you need to interact with cron?
Rather than creating a scheduled process?
If the later then you start with the OS and at least a brief description of what task needs to be achieved.
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I'm sure I'm missing something obvious here but I don't see it ...
I am constructing a menu at runtime from an XML document, which is being read into a data class created with the xsd utility. This is all fine. As part of constructing the menu itself, I assign to the ShortcutKeys property:
if (!string.IsNullOrEmpty(level.Accelerator))
menuItem.ShortcutKeys = (Keys)TypeDescriptor.GetConverter(typeof(Keys)).ConvertFromString(level.Accelerator);
Accelerator is a property auto-generated by xsd and looks like "Ctrl+N", "F4" etc, and this line is running when it should.
The result is that my menu is correctly built, and shortcut keys appear in the menuitems, but pressing the key doesn't cause the Click event to fire. If I first open that menu, the shortcuts fire (i.e. if I open 'File' and press Ctrl+O, the open dialog appears), but they do not if the menu on which the item lives is not opened. (Obviously this is not correct behaviour.)
Just wondering if someone has seen something similar and can tell me what simple step I am missing.
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I have a listbox in which I'm keeping several expanders. At the beginning all expanders are collapsed. The height of the listbox is just enough to show them all. After I expand one of those expanders, the height of listbox is increased accordingly. However, when I collapse this expander, height of the listbox remains unchanged, leaving huge white space. How to refresh listbox size?
Thank for help in advance
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Have you considered This Page[^]?
You can expand the size by Add.Item == Add.Point, that is to say define the size 'By Each' add.item.
------------------------------------
I will never again mention that I was the poster of the One Millionth Lounge Post, nor that it was complete drivel. Dalek Dave
CCC Link[ ^]
Trolls[ ^]
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Listbox contains expanders and each of them has different size. The problem is not growing. The problem is to shrink listbox after collapsing expander.
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Hi,
I make a registration form but I have problem when 20 members register in the SAME TIME , what is the best strategy to handle this problem with inserting row in the same time using ado 2.0 and example if available.
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Honeyboy_20 wrote: I have problem
What are the symptoms? What database? What sort of client (Web, WinForms, etc.)?
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What is your problem? Is it timeout or is it concurrency or is it something else? We don't do mind-reading here and we'll not be able to help you unless you are specific about your problem.
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IMO, you don't have too much of an issue while doing an insert. An update or delete can create more issues in terms of concurrency.
However, you can run a check on all existing users to probably check if the user does not already exist.
Too much of heaven can bring you underground
Heaven can always turn around
Too much of heaven, our life is all hell bound
Heaven, the kill that makes no sound
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Are you using the time as some sort of key? If so, don't. Either use an auto_increment column or a GUID as a key so it doesn't matter if you get two entries within the resolution of the timer.
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As you can see from the responses you have gathered here, people are having a real problem understanding what the issue you are suffering really is. As a hint, when posting a question, try to put in as much relevant detail as you can. A description of what you are trying to achieve, along with a relevant code snippet, details of your expected output and a description of the error will help you get a detailed answer to your problem.
If you could edit your question to include this information, I look forward to helping you.
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in the end it is not a problem. A database will handle each insert seperately so it will not add two or more rows at once.
In Word you can only store 2 bytes. That is why I use Writer.
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I'make asp project but my problems happens when over 20 users register in the same time , i found that only 3 users register in db however all 20 users received message that they made registration successfully.
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do you use statics or some kind?
In Word you can only store 2 bytes. That is why I use Writer.
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