inside my c# code I wish to have a global variable, for instance decimal price
and when something is selected, a basic price is determined, and then with other class functions, stuff can be modified to change the price.
for instance one of 2 cars is selected, so the price can be 10k or 12k, and then tires can be upgraded, increasing the price for 500.
when i put a decimal price inside the partial class (the main container), each time a method is called this value is set to 0, so I only get the value of 0 + 500, and not 10 000 +500 or 12 000 + 500
I know this is the wrong way of doing this, and this data should be inside databases, but this is how it is supposed to be done now...
i also know that this value can be put inside a hidden label, but i dont want to do that
B-) Please help me by completing my school survey about computer programmers on my website. Thank you!!! Gerry Lowry +1 705-429-7550 wasaga beach, ontario, canada
Marked as answer by Allen Li - MSFT on May 11, 2012 01:28 AM
If your global variable is intended to be shared by all users of your site so they all see and update that one single variable, then a static does work. Most of the time though when people are asking this question, they are either looking for a method to
allow a variable to survive page postbacks (scoped to the page) or their looking for a way to preserve a value across multiple pages for a single user (scoped to a user).
Since your price variable seems to change based on user selections, i'd say that using a static would represent a bug in the code as two or more users making sleections would share just the one price variable.
cdf
Member
31 Points
61 Posts
global variable
May 05, 2012 03:37 PM|LINK
GOT IT - STATIC DECIMAL
inside my c# code I wish to have a global variable, for instance decimal price
and when something is selected, a basic price is determined, and then with other class functions, stuff can be modified to change the price.
for instance one of 2 cars is selected, so the price can be 10k or 12k, and then tires can be upgraded, increasing the price for 500.
when i put a decimal price inside the partial class (the main container), each time a method is called this value is set to 0, so I only get the value of 0 + 500, and not 10 000 +500 or 12 000 + 500
I know this is the wrong way of doing this, and this data should be inside databases, but this is how it is supposed to be done now...
i also know that this value can be put inside a hidden label, but i dont want to do that
Bimalvv
Contributor
2356 Points
478 Posts
Re: global variable
May 05, 2012 03:41 PM|LINK
You can set the decimal price in Application value like this in your Global.asax file
void Application_Start(object sender, EventArgs e) { // Code that runs on application startup Application["price"] = 10; }and retive like this
Bimal
cdf
Member
31 Points
61 Posts
Re: global variable
May 05, 2012 03:47 PM|LINK
are global variables the way i did it a bad practice (static decimal price)?
gerrylowry
All-Star
20513 Points
5712 Posts
Re: global variable
May 05, 2012 05:26 PM|LINK
@ cdf
TIMTOWTDI =. there is more than one way to do it
anything you hard code might become problematic at some future date.
ideally, you do not want to have to recompile your program for a simple change in some value.
for things that never change, such as the value of Pi (which is available via System.Math.PI as 3.14159265358979), having a const (http://msdn.microsoft.com/en-us/library/e6w8fe1b.aspx) is an adequate solution.
for things that may change, using a .config file, a row+column in a database table, or the system registry are, imho, better solutions.
n.b.: using the system registry is somewhat challenging since Registry Virtualization (http://msdn.microsoft.com/en-us/library/windows/desktop/aa965884.aspx) was introduced starting with Windows Vista.
g.
mbanavige
All-Star
134950 Points
15415 Posts
ASPInsiders
Moderator
MVP
Re: global variable
May 05, 2012 05:32 PM|LINK
If your global variable is intended to be shared by all users of your site so they all see and update that one single variable, then a static does work. Most of the time though when people are asking this question, they are either looking for a method to allow a variable to survive page postbacks (scoped to the page) or their looking for a way to preserve a value across multiple pages for a single user (scoped to a user).
Since your price variable seems to change based on user selections, i'd say that using a static would represent a bug in the code as two or more users making sleections would share just the one price variable.
Check out session or viewstate as options:
http://wiki.asp.net/page.aspx/58/viewstate/
http://wiki.asp.net/page.aspx/57/session/
http://wiki.asp.net/page.aspx/30/state-management/