using System;

using System.Web;

using System.Linq;

using Microsoft.AspNetCore.Http.Extensions;

public class Program

{

    public static void Main()

    {

        var tuple = RemoveQueryStringByKeys("https://beta.bds.lc/ban-dat-duong-luong-van-nho-xa-long-hoa-prj-la-maison-de-can-gio/bai-viet-duoc-them-tu-postman-tu-dong-pr31508143?utm_source&utm_campaign=456&price=5", new string[]{"utm_"});

        var item1 = tuple.Item1;

        var item2 = tuple.Item2;

        Console.WriteLine(item1);

        Console.WriteLine(item2);

    }

     public static Tuple<string, string> RemoveQueryStringByKeys(string url, string[] keys)

        {

            var uri = new Uri(url);

​

            // gets all the query string key value pairs as a collection

            var newQueryString = HttpUtility.ParseQueryString(uri.Query);

​

            // removes the key if exists

            QueryBuilder queryBuilder = new QueryBuilder();

            foreach (var key in keys)

            {

                var findKeys = newQueryString.AllKeys.Where(k => k != null && (k.Equals(key) || k.StartsWith(key)));

                foreach (var findKey in findKeys)

                {

                    // save valid query param

                    queryBuilder.Add(findKey, newQueryString[findKey]);

                    // remove valid query param

                    newQueryString.Remove(findKey);

                }

            }

​

            // gets the page path from root without QueryString

            string pagePathWithoutQueryString = uri.GetLeftPart(UriPartial.Path);

​

            var finalUrl = newQueryString.Count > 0

                ? String.Format("{0}?{1}", pagePathWithoutQueryString, newQueryString)

                : pagePathWithoutQueryString;

​

            var validQueryString = queryBuilder.ToQueryString();

​

            Tuple<string, string> tupleResult =

            new Tuple<string, string>(finalUrl, validQueryString.ToString());

​

            return tupleResult;

        }

}