Call a function inside an event handler

Question

Hello,

I am watching a directory so i am using system watcher and on the event handler, I would like when the event happens, to execute a function that does a specific job. How can i call a function inside the event handler or a way to say that when the event happens, go and do what is written in the following function. Thanks in Advance

static void OnChanged(object source, FileSystemEventArgs e)
    {
        // Specify what is done when a file is changed, created, or deleted.

        Console.WriteLine("File: " +  e.FullPath + " " + e.ChangeType);
        SomeGlobalVariables.counter++;
        SomeGlobalVariables.Range = SomeGlobalVariables.counter + 1;
        Console.WriteLine("Counter is" + SomeGlobalVariables.counter + "," + "Range is" + SomeGlobalVariables.Range);

// Call function ReadData(string[,]Result)


    }

static void ReadDATA(out string[,] Result)
        {
// Operation
// Or should i call the event handler here?
}