value of ASP.NET variables for different users
<p>I'm using VS2010,C# to develop my ASP.NET web app, sometimes I need to declare public or even public static variable at start of my codebehind files, so that I can access them globally in the file and also they preserve their value between postbacks, everything works fine on my local server (as I'm the only person who runs the code). But I don't know exactly what happens when this page (and therefor its codebehind) are run by several web site visitors at the same time, I want my program to run the same for all users, but I think in this way something will cause problems, I can remember from my previous ASP.NET experience that using variable (public or public static) in codebehind can cause misunderstanding for different users of web site, for instance:
user A runs program, (public static int) my_int that had the value of -1 at startup has taken value of 100, and at this time user B runs the same page, so my_int is 100 and it will cause problems, also suppose that user A leaves the page while my_int has value of 100, then user B will visit the page my_int would be initially 100 (while that should be -1) so I think unexpected behaviors would occur</p>

<p>is it right? will this happen at all? if so, how can I prevent it? should I use session instead of variables? how can I have a better understanding about the whole situation</p>

<p>thanks friends</p>
