using System;                   

public class Program{

    public static void Main(){

        Console.Write("Enter a String: ");

        string word = Console.ReadLine();

        Console.Write("Remove a character in the String : ");

        string removechar = Console.ReadLine();

        string output = "";

        char[] Array = word.ToCharArray();

        for(int i = 0; i < word.Length; ++i)

        {

            string letter = Convert.ToString(Array[i]);

            if (removechar.ToLower().Contains(letter)){

                continue;

            }

            else{

                output += letter;

            }

        }Console.Write("\n Output : {0}", output);

    }

}

​