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Archive for March 19th, 2010

Metronidazole Gel For Sale

Friday, March 19th, 2010

…Continued from part 1

Metronidazole Gel For Sale, In part 1, I scolded you for showing error messages to users. I suppose I should ‘fess up though and just admit that I’ve shown my share of error messages over the years! The more I consider the problem though, the more I think that error messages are a bit of a lazy way out.

In this part, let’s get to a more practical level and talk about when it might seem important to show messages. Hopefully we can find ways to avoid most of them. There may well be other classes of messages that seem to require message boxes, but I’ll start with these.

Reasons to show a dialog:

Fatal error such as an unhandled exception
Environment problem like file missing, bad permissions, hardware disconnected
Transient outage (network, file server, database)
The user must take action (user mistake, conflict with existing record)
Warning/info message like update available

Fatal errors

On the surface this might seem like a no-brainer. If you catch an unhandled exception in your Application object, then there just isn’t much that you can do about it. Clearly, the ideal would be to avoid it, but it’s too late. On the other hand, this is very valuable information. This is definitely when you want your users to let you know so you can prevent it from happening again. Remember though, that your user clicked OK, the dialog disappeared, and then the whole app went away. Totally unexpected!

If the user can restart the app and keep going, then you probably won’t ever hear about it. Sometime, over lunch, you might hear people make a mention of “that one” problem that happens a few times each week. Don’t bother getting annoyed that no one reported it. Code defensively!

If you can send that exception, the current record, any temp files, or anything else that would be useful, then you’ll be in much better shape. Write the data to a tracker database, open a help desk ticket, whatever you need to do. Rather than trying to reproduce an error that might happen once in a thousand times, this give you hard data from the time that it did happen.

Environment problems

These can be tricky. If a file is missing or has the wrong permissions then something important just isn’t going to happen. If hardware is disconnected, then your bar code scanner will be useless. The good thing about most of these errors is that you can check for the condition before anything goes wrong.

If hardware is missing, display a message (I never said dialogs are completely forbidden!). The trick is to do the work on the user’s behalf as much as possible. The user will need to reconnect the device, but your code can check periodically and “unlock” the application when it appears. After all, if it’s required, then clicking OK doesn’t serve any purpose unless the device is back anyway.

You can check for files to exist or even read-write permissions before writing. Instead of a generic unhandled exception since “that file won’t ever be set to read-only” just expect it. Log and send the error, then let the user know that the application isn’t useable without help desk intervention. The worst thing is for the user to get through four screens of data entry just to lose everything due to an “impossible error.” Make it work every time for your users. You’ll have a better reputation and better information about what needs attention.

Outage

Databases stop responding. Network links go down. File servers get rebooted during production hours. There isn’t much that you can do about them, but you pretty much know that the issue won’t last forever. Let the user know that there is an outage, and make it clear that retrying is happening automatically. Users hate “please retry.” They already attempted it and it failed. They are starting out annoyed and this won’t help.

Required action

Clearly there are situations where you can’t do anything for the user. Is a required field missing? Did another user update the same record and cause a conflict? I hate to admit it, but here’s a situation that can’t be avoided. At the same time though, you can do a better job with it. Is a field blank or formatted wrong? Jump to the field and flash a bright red outline around it. Did the update cause a conflict? Create a region above or below your contents that only appears with critical information. Just like a web application will often have an error message area, there’s no reason why a desktop application can’t do the same thing. A dialog gets dismissed and forgotten. Show the message until the update is successful so the user can actually benefit from the information.

Warning/Info messages

Now these are definitely the bane of any user. A message that says “record saved” is just a stupid impediment to the work flow. Flash an indicator somewhere, show a non-modal notification (balloon dialog), or use a status bar in the application. Just don’t interrupt for something that has no business interrupting. The user only cares when something goes wrong – otherwise stay out of the way!

Continued in part 3…

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Buy Augmentin Without Prescription

Friday, March 19th, 2010

Buy Augmentin Without Prescription, In my last post I began looking at variables. Now I will go over types and how they function, Augmentin without a prescription. Augmentin no rx, Windows PowerShell supports a number of different types such as strings, integers, Augmentin results, Augmentin mg, arrays, etc, purchase Augmentin online no prescription. Augmentin alternatives, You can explicitly specify a type or allow Windows PowerShell to do it dynamically, which is sometimes referred to as automatic type conversion, Augmentin dosage. Effects of Augmentin, Type conversions are used when an object of one type is assigned a value that requires another type (such as adding a string to a number). This conversion happens automatically as long as the type was not specified manually, and it is not destructive to the original object, Buy Augmentin Without Prescription.
For example we can assign a new value to the $Loc variable which currently has the System.Management.Automation.PathInfo type, Augmentin australia, uk, us, usa, Augmentin description, and then use the GetType method to show its new type.
$Loc = "Test" $Loc.GetType().FullName

Then, buy cheap Augmentin, Where can i buy cheapest Augmentin online, assign it a numeric value and check the type again.
$Loc = 3 $Loc.GetType().FullName

$Loc was made an Int32 because the value wasn't enclosed in quotes and because the value was composed solely of digits, Augmentin class. Augmentin no prescription, Had it been in quotes, it would have been interpreted as a System.String, where can i cheapest Augmentin online. Buy Augmentin Without Prescription, In both cases, Windows PowerShell determined the data type that was the most appropriate for the value of the variable. What is Augmentin, This should work for most variables but there may be situations where you want the variable type to remain as it is. Suppose you are reading values out of a file and you always want the values to be treated as strings, buy Augmentin without a prescription. Augmentin duration, Some of the values, however, Augmentin natural, Augmentin pics, might contain only digits, raising the possibility that Windows PowerShell would treat them as Int32 or another numeric type, order Augmentin from mexican pharmacy, Online buy Augmentin without a prescription, which may create problems for your script. If Windows PowerShell does not recognize the value as a string, japan, craiglist, ebay, overseas, paypal, Online Augmentin without a prescription, then all the methods of the System.String class are not available (and your script might rely on one of these unavailable methods).
Manually assigning a type is simple and is done when you create it, Buy Augmentin Without Prescription. Assigning a string to a variable essentially forces the variable to be of the System.String class, online buying Augmentin. Australia, uk, us, usa, Assigning a number to a variable, on the other hand, Augmentin canada, mexico, india, Buying Augmentin online over the counter, usually results in the variable becoming an Integer (or, more specifically, Augmentin forum, Cheap Augmentin, an Int32, which can store a specific range of values). For example, we can create a new variable and define it as a string.
[String]$var = 5 $Var.GetType().FullName

Normally, $Var would have been an Int32, but because we defined it as a String, it makes the numeric value we assigned to it a string. Buy Augmentin Without Prescription, Forcibly declaring variables does have repercussions, though they are not necessarily bad. In the next example, a new variable is created, defined as an integer, and assigned a numeric value. Then, it is assigned a string value.
[Int]$Num = 4 $Num = "test"

As shown above, when we tried to assign a string value to it, an error message was displayed. Because $Num was defined as a Int32, Windows PowerShell expected to convert the string "test" into an integer value. It was unable to do this, nor was it able to change the type of $Num to String.
In my next post we continue to look at types.

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Archive for March 19th, 2010