如何处理并发连接ASP Net（C＃）

Question

I have written a simple webapp in asp net. The first time I go through the program Everything works fine, but if I go there again it uses that variables from my last session.

So the questions are

1. Is there anyway to correct this?

2. Does it have something to do with how I make my public variables?

3. Could I store the variables as cookies, then delete them when the page closes?

This is how I make my public variables:

static class vars
{
    public static List<string> directory_names = new List<string>();
    public static List<string> directory = new List<string>();  
    public static int numvar = 0;
    //There are more but they all are made the same way
}

Any Ideas are welcome.

Thanks, Adam

Answer 1

You should avoid static as it means the variable will be the same for every user connected (plus you will probably face threading issue).

Here is a link on SO about this: What is better: Static variable VS Asp.NET Application Session?

Answer 2

There are several thing we need to address here.

First of all, I think there are more code involved than the class you provided. I think you need to add that in order for us to give you an accurate answer.

However, from what I can see from the class you have provided, there is one thing in particular that you have done and that is the static keyword.

The static keyword on a class and/or a property means that there is only one instance in the entire application domain . This means that all requests to you website will share the values of your vars class as there is only one instance.

I suggest you to follow some ASP.NET tutorials and videos, to gather some basic understanding in ASP.NET. Get started here, they have excellent material: http://www.asp.net/get-started

Read more on the static keyword: http://msdn.microsoft.com/en-us/library/98f28cdx(v=VS.100).aspx