Thread-safety In .NET With AJAX?

Dec 17, 2010

The question is, is it possible that requests for the same session are executed from multiple threads? Are methods in ASP.NET reentrant? Especially we are using AJAX which means that asychronous requests are taking place.

Would this mean to place locks around operations on objects placed inside the session?I know that locks are essential when handling static and application wide variables, but the question is is the same true for session objects?

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public static string TestMethod(string s1, string s2, string s3)
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....
...
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[code]....

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[Code].....

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Here the code

Code:

[code]....

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some details of image:

MessageID 14 and 19 are starting thread.

1 0 Yogendra1 Mishra 19 new msg
0 14 Yogendra1 Mishra 17 y
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1 0 Yogendra1 Mishra 14 y

i want max messageid of each thread.

now my output should be.

19
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C# - Looking For .NET Lock Thread Method?

Mar 30, 2010

I'm developing an ASP.NET forms webapplication using C#. I have a method which creates a new Order for a customer. It looks similar to this;
private string CreateOrder(string userName) {
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Order order = FetchOrder(userName);[code]....

The problem here is, it is possible that 1 customer in two requests (threads) could cause this method to be called twice while another thread is also inside this method. This can cause two orders to be created.

How can I properly lock this method, so it can only be executed by one thread at a time per customer?

I tried;

Mutex mutex = null;
private string CreateOrder(string userName) {
if (mutex == null) { [code]....

This works, but on some occasions it hangs on WaitOne and I don't know why. Is there an error, or should I use another method to lock?

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