How to check prime number in C#

static void Main(string[] args)
        {
            int PNumber;
            int Counter = 2;

            Console.WriteLine("Please enter any number.");
            PNumber = Console.Read();

            while (Counter < PNumber)
            {
                if (PNumber % Counter == 0)
                {
                    break;
                }
                else
                    Counter++;

            }

            if (Counter == PNumber)
                Console.WriteLine("Number is prime.");
            else
                Console.WriteLine("Number is not prime.");

            Console.ReadLine(); 
        }