What is Thread static attribute in c#

the thread calls its own call stack that stores all methods are executed, local variables are stored on the call stack and private to the thread.

A thread can also have its own data that's not a local variable, By making a field with static attribute, each thread makes its Own copy of field

class Program
    {
        [ThreadStatic] // remove and chek 
        public static int _field;
        static void Main(string[] args)
        {
            // threastatic attribute

            new Thread(() =>
            {
                for (int i = 0; i < 10; i++)
                {
                    _field++;
                    Console.WriteLine("Thread A:{0}", _field);
                }
            }).Start();
            new Thread(() =>
            {
                for (int i = 0; i < 10; i++)
                {
                    _field++;
                    Console.WriteLine("Thread B: {0}",_field);
                }
            }).Start();
            Console.ReadKey();
        }
    }