Connected Cell In a Grid - Hacker Rank - practice code and see if I can speed up

ConnectedCellInaGridP1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace continuedCellsInaGrid
{
    class Program
    {
        static void Main(string[] args)
        {
            int row = Convert.ToInt32(Console.ReadLine());
            int col = Convert.ToInt32(Console.ReadLine());

            int[,] arr = new int[row, col]; 

            for (int i = 0; i < row; i++)
            {
                string s = Console.ReadLine().ToString();

                int j=0; 
                foreach (char c in s)
                {
                    //while(c=='0' || c=='1')   // not while, causing timeout 
                    if (c == '0' || c == '1')
                    {
                        arr[i,j] = (int)(c - '0');
                        j++; 
                    }                    
                }
            }

            Console.WriteLine(getMaxRegin(arr)); 
        }

        public static int getMaxRegin(int[,] arr)
        {
            int row = arr.GetLength(0);
            int col = arr.GetLength(1); 

            int max = int.MinValue; 
            for(int i =0; i< row; i++)
                for (int j = 0; j < col; j++)
                {
                    int val = getCount(arr, i, j); 
                    max = val > max? val: max; 
                }

            return max; 

        }

        private static int getCount(int[,] arr, int posX, int posY)
        {
            int row = arr.GetLength(0);
            int col = arr.GetLength(1);

            if (posX >= 0 && posX < row && posY >= 0 && posY < col && arr[posX,posY] == 1)
            {
                arr[posX, posY] = 2; 

                int count = 1; 
                for(int dr = -1; dr<=1; dr++)
                    for (int dc = -1; dc <= 1; dc++)
                    {
                        int tmpX = posX + dr; 
                        int tmpY = posY + dc;
                        
                        count += getCount(arr, tmpX, tmpY);  
                    }
                return count; 
            }

            return 0; 
        }
    }
}