how to make a program which checks and count occurrences characters in a string in c#

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In this article, I will show, how to make a program which checks and count occurrences characters in a string in c#

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq.Expressions;

namespace testconsole

{
    class Program
    {
     
        static void Main(string[] args)
        {

            string input = "this is Manvendrs Patel Blog ";
            string chekvalue = "";
            for  (int i = 0; i < input.Length; i++)

            {
            if (chekvalue.Contains(input[i].ToString()))
                {
                }
                else {
                    chekvalue = input[i] + chekvalue;
                    Console.Write(input[i] + " : ");
                    int count = 0;

                for (int j = 0; j < input.Length; j++)

                {

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

                    {

                        count++;

                    }

                }

                Console.WriteLine(count);
                }
             
            }

            Console.ReadLine();

     
            }

       
     
        }
     
    }



 

   




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