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class ShareDataInstanceVariable
{
    string instanceString = "*";

    public void Print(string threadMethodParam)
    {
        for (int i = 0; i < 3; i++)
        {
            Console.WriteLine(string.Format("ThreadID: {0} {1} {2}", 
                Thread.CurrentThread.ManagedThreadId, threadMethodParam, instanceString));
            Thread.Sleep(10);
        }
    }

}
class Program
{
    static void Main(string[] args)
    {
        ShareDataInstanceVariable threadTest = new ShareDataInstanceVariable();
        
        //Thread has separate call stack
        Thread newThread = new Thread(() => threadTest.Print("+"));            
        newThread.Start();

        //Main thread
        threadTest.Print("-");

        Console.ReadLine();
    }
}

//Output
ThreadID: 10 - *
ThreadID: 11 + *
ThreadID: 10 - *
ThreadID: 11 + *
ThreadID: 11 + *
ThreadID: 10 - *