ASP.NET - Different threads writing to the same file causing problems

Question

I've got a method which performs a delete and create file. there are issues with the threads all trying to access the file at the same time.

How can i limit access to the file?

public static Save(string file)
{
  //1.Perform Delete
  //2.Perform Write 
}

Note that the method is static so is it possible to lock the process within the static method?

Cheers

Answer 1

private static readonly object _syncRoot = new object();
public static void Save(string file)
{
    lock(_syncRoot) {
        //1.Perform Delete
        //2.Perform Write 
    }
}

Or you could use the MethodImplAttribute which puts a lock around the whole method body:

[MethodImpl(MethodImplOptions.Synchronized)]
public static void Save(string file)
{
    //1.Perform Delete
    //2.Perform Write 
}

Answer 2

You will have to use a lock on a static object.

private static Object saveLock = new Object();

public static Save(string file)
{
   lock (saveLock )
   {
     //...
   }
}

Answer 3

Have a look at this thread which discusses the use of the lock statement.