How to Count no of repeated character in a String?

How to Count no of repeated character in a String?

Input   : ababcgah

OutPut : a3b2g1h1

Input : shivKvish

Output : s2h2i2v2k1

static void FindCharinString(string arr)

        {

{

           

          

            char[] chr = arr.ToCharArray();

            Array.Sort(chr); //SORTING ARRAY

            string newstr = "";

            for (int i = 0; i < chr.Length - 1; i++)

            {

                int count = 1;

                for (int j = i + 1; j <= arr.Length - 1; j++)

                {

                    if (chr[i] == chr[j])

                    {

                        count=count+1;

                    }

                    if (chr[i] != chr[j])

                    {

                        newstr += chr[i].ToString() + count;

                        i = j-1;

                        break;

                    }

                }

            }

            Console.WriteLine(newstr);

           

        }

  Output : K1h2i2s2

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