Outputs to the console the array itself, the number that is repeated the most number of times in a row and the number of its repetitions. (An additional array is not created on purpose.)

Subarray of repeating numbers

namespace MyCode
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int arraySize = 30;
            int[] numbers = new int[arraySize];
            int maxValue = 10;
            int counter = 0;
            int length = 0;
            int value = 0;
            int reset = 0;
            int temporary = numbers[0];

            Random random = new Random();

            for (int i = 0; i < arraySize; i++)
            {
                numbers[i] = random.Next(maxValue);
                Console.Write(numbers[i] + " ");

                if (numbers[i] == temporary)
                {
                    counter++;

                    if (counter > length)
                    {
                        value = temporary;
                        length = counter;
                    }
                }
                else
                {
                    temporary = numbers[i];
                    counter = reset;
                    counter++;
                }
            }

            Console.WriteLine($"\n\nValue: {value}, was repeated {length} times");
        }
    }
}