SharePoint modifies users and groups display name and email address C # code

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Text;
Using Microsoft.SharePoint;
Using System.Web;
Using Microsoft.SharePoint.Administration;
Using System.IO;

Namespace ConsoleApplication1
{
Class Program
{
static void Main (string[] args)
{
Console.WriteLine ("Please input url");
String siteurl = Console.ReadLine ();
string[] temp = System.IO.File.ReadAllLines ("Userid.txt", System.Text.Encoding.UTF8);

foreach (string struser in temp)
{

String[] Arruser=struser. Split (' | ');

String keyaccount = Arruser[0];
Uri Webappuri = new Uri (SiteURL);
Spwebapplication WebApplication = Spwebapplication.lookup (Webappuri);
String newName = Arruser[1];
String newemail = Arruser[2];
foreach (SPSite sitecollection in webapplication.sites)
{

using (SPSite onesite = new SPSite (Sitecollection.url))
{
using (SPWeb webApp = Onesite.openweb ())
{

foreach (SPUser SPUser in Webapp.siteusers)
{
if (SPUser. Loginname.toupper () = = Keyaccount.toupper ())
{
Try
{
String oldname = SPUser. Name;
String oldemail = SPUser. Email;
string url = webapp.url;
SPUser. Name = NewName;
if (!string. IsNullOrEmpty (Newemail.trim ()))
{
SPUser. Email = Newemail;
}
SPUser. Update ();

FileStream fs = new FileStream (System.Environment.CurrentDirectory + @ "\log.txt", FileMode.OpenOrCreate, FileAccess.Write);

System.IO.StreamWriter SW = new System.IO.StreamWriter (FS);
Sw. Basestream.seek (0, Seekorigin.end);
Sw. WriteLine (DateTime.Now.ToString () + "" + "Site:" + URL + "Account:" + SPUser. LoginName + "Name:" + oldname + "change to" + SPUser. Name + "Email:" + oldemail + "change to" + SPUser. Email);
Sw. Flush ();
Sw. Close ();
Fs. Close ();

}
catch (Exception ex)
{
Console.WriteLine (ex. Message + ex. StackTrace);
}
}
}
}
}
}
}
}
}
}

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SharePoint modifies users and groups display name and email address C # code