Cannot convert from object to string, dictionary c#

try to add arraylist from array and add into dictionary (string and integer) and finally sort the value of the dictionary.

while adding to dictionary, getting
'cannot convert from objecct to string.'

static void Main(string[] args)
        {
            string[] strArray = { "A", "B", "C" };
            int[] intArray = { 3, 2, 1 };

            ArrayList alstr = new ArrayList();
            ArrayList alint = new ArrayList();

            for (int m = 0; m < strArray.Length; m++)
            {
                alstr.Add(strArray[m]);
            }

            for (int n = 0; n < intArray.Length; n++)
            {
                alint.Add(intArray[n]);
            }

            object[] myStringArray = alstr.ToArray();
            object[] myIntArray = alint.ToArray();

            var dict = new Dictionary<string, int>();

            //foreach (string strArray01 in strArray)
            //{
            //    foreach (int intArra01 in intArray)
            //    {
            //        dict.Add(strArray01, intArra01);
                    
            //        break;

            //    }

            //}

            for (int o = 0; o < myStringArray.Length; o++)
            {
                dict.Add(myStringArray[o], myIntArray[o]);
            }

            //for (int i = 0; i < strArray.Length; i++)
            //{
            //    dict.Add(strArray[i], intArray[i]);

            //}
                var items = from k in dict.Keys
                            orderby dict[k] ascending
                            select k;


            


            foreach (string kv in items)
            {

                Console.WriteLine("Key : {0}, Value : {1}", kv, dict[kv]);

            }

            Console.ReadLine();

        }
    }

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