How to generate a sequential unique id in a thread-safe way

Question

i have called multiple threads which generates a number but i wanted to generate a unique no with all threads,( suppose one thread generates a no ie ABC1 but second thread must generate ABC2 and so on)

Answer 1

You could use Interlocked.Increment, which will complete a thread safe increment on the counter.

public class Person
{
    private static int _counter;

    public string GetNewId()
    {
        int id = Interlocked.Increment(ref _counter);
        return $"ABC{id}";
    }
}