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I am creating a web application, in which a form update the XML file. I am getting an error if a user wants to write XML which is all ready writing by another user. How to synchronous this request one by one.
I used Semaphore and Lock, but either of them not working.
I used Lock
public static object obj_Lock = new object();
private void Button_Click(object sender, EventArgs e)
It is working well for two users, when multiple users access this method it raise a error, file used by another process.

public static Semaphore sem_Dest_XML = new Semaphore(1, 1);

private void Button_Click(object sender, EventArgs e)
XML_Record obj_Record = new XML_Record();


In Samaphore I am not getting the sequence, suppose user_1 click first, user_2 click Second and User_3 Click Three. But it is executed in User_1 as First, User_3 as Second and User_2 as Last.
How to solve This.

1 solution

You could simply not make a file available until it can be opened. Force the user to click a button to see a list of available files, and refresh that list when they do.

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