Question

To Handle the error in my web application
I am Creating a log file which will be created in Application_Error() event of global.asax
and Those log file created based on date (1 per day)

I am Considering scenario where error occured and at same instance of time
file getting write from multiple users at same time

so it may throw exception that file already being used by another user
it may be like that i am not sure

can anybody help to deal with such scenario

many thanks

Answer 1

Use mutex to lock your writing procedure. I suggest mutex, and not lock() because can catch all pools/threads that may throw an error.

On MSDN there are the details about mutex and examples:

http://msdn.microsoft.com/en-us/library/system.threading.mutex.aspx

a simple example

public void LogThis(string LogDetails) 
{
    var mut = new Mutex(true, "LogMutexName");

    try
    {   
        // Wait until it is safe to enter.
        mut.WaitOne();

        // here you open write close your file
    }
    finally
    {
        // Release the Mutex.
        mut.ReleaseMutex();
    }   
}