int[] int1 = new int[3] { 1, 2, 3 };
            int[] int2 = new int[3] { 4, 5, 6 };
            string[] str = new string[int1.Length + int2.Length];

            for (int i = 0; i < str.Length; i++)
            {
                if (i < int1.Length)
                {
                    str[i] = int1[i].ToString();
                }
                else
                {
                    str[i] = int2[i - int1.Length].ToString();
                }
               
            }
            for (int j = 0; j < str.Length; j++)
            {
                Console.Write(str[j] + "  ");
            }