How to replace different words from list found in string with specific word

Question

How to replace different words from list found in string with specific word "x" :

string str = "how to replace different words from list found in string with specific word"; 

var valueList = new List<string> { "replace", "string", "specific", "found", "how", "word"};  

if (valueList.Any(str.Contains))   
{
   //...                       
}

if with if-statement I can do it one by one str.Replace("replace", "x"); etc., but not sure how to properly get same result from listed values:

x to x different words from list x in x with xx

Answer 1

With Linq flavour:

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

public class Program
{
    public static void Main()
    {
        string str = "how to replace different words from list found in string with specific word"; 

        var valueList = new List<string> { "replace", "string", "specific", "found", "how", "word"};  

        var result = valueList.Aggregate(str, (current, c) => current.Replace(c, "x"));

        Console.WriteLine(result);
    }
}

EDIT:

.NET Fiddle: https://dotnetfiddle.net/BVJphf