【C#】Get the html code of a webpage

As for the title,the console program will show you a sample which can get the webpage-code.Enjoy it:)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using System.Runtime.InteropServices; //dllimport relies on it
namespace WebPageCode
{
    
    class Program
    {
        
        [DllImport("kernel32.dll")]
        static extern uint GetTickCount();  

        static void addhead(ref string px) //add http head if necessary
        {
            if (px.Substring(0, 7).ToLower() != @"http://") px = @"http://" + px;
        }

        static string getwebcode(string PageUrl,string proxy=""){

            uint x = GetTickCount();

            addhead(ref PageUrl);  //webpage check
            WebClient wc = new WebClient(); 
            wc.Credentials = CredentialCache.DefaultCredentials; 
            
            proxy.Trim();  //proxy check
            if (proxy != "")
            {
                addhead(ref proxy);
                WebProxy wp = new WebProxy();
                wp.Address = new Uri(proxy);
                wc.Proxy = wp;
            }

            Byte[] pageData = wc.DownloadData(PageUrl); 
            x = GetTickCount() - x; //x means the time spent.
            return Encoding.UTF8.GetString(pageData);

        }

        static void Main(string[] args)
        {
            int i = 0, n = args.Length;
            string proxy = "";
            string page = "";
            while (i < n)
            {
                if (args[i] == "-proxy")
                {
                    if (i<(n-1)) proxy = args[++i];
                }
                if (args[i] == "-page")
                {
                    if (i < (n - 1)) page = args[++i];
                }
                i++;
            }
            page.Trim(); proxy.Trim();
            if (page == "") return; //no webpage found
            string code;
            if (proxy == ""){
                code=getwebcode(page);  //proxy found
            } else {
                code=getwebcode(page,proxy);  //no proxy found
            }
            
            Console.Write(code);
            Console.ReadKey();
        }
    }
}