Static classes: to use or not to use?

[BLUE]

I know it's a stupid question but...
I want to use a class that represents the current user of my application,
another one that reads position from a GPS receiver and another one that
reads RFID tags from a reader.
I don't want to create a new user each time a log in appens (only one login
at a time: mobile device) and I do not want to create a new object each time
I read position or a tag, so it's right to use static classes and to update
static fields (e.g. GPS.position or Tag.Id) every time a read happens?

Thank you.
Bye,
Luigi.

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

"BLUE" <bluewrote in message
news:46***********************@reader2.news.tin.it ...

>I know it's a stupid question but...
I want to use a class that represents the current user of my application,
another one that reads position from a GPS receiver and another one that
reads RFID tags from a reader.
I don't want to create a new user each time a log in appens (only one
login at a time: mobile device) and I do not want to create a new object
each time I read position or a tag, so it's right to use static classes
and to update static fields (e.g. GPS.position or Tag.Id) every time a
read happens?

Yes, it's ok.

Personally I would make the user a Singleton class. You will create an
instnce (and only one) at any moment.

The GPS & RFID classes should be static.
One thing you should pay especial attention is the events of these classes.
You may have more than one form that receive events from these classes. if
this is the case you will need to hook/unhook the handlers as you show/ihde
the forms.