using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<string> productsAll = new List<string>();

        productsAll.Add("CMT_40");

        productsAll.Add("CMT_50");

        productsAll.Add("Mortar");

        productsAll.Add("Mortar");

        productsAll.Add("Mortar");

        string itemToRemove = "Mortar";

        productsAll.RemoveAll(x=>x==itemToRemove);      

        Console.WriteLine("After removal :{0}",String.Join("\n",productsAll));

    }

}