Difference between 4 statements - PLease Explain

Question

Hi all... Please Explain........

What is the difference between -

1. Page.User.Identity.Name

2. HttpContext.Current.User.Identity.Name.ToString();

3. System.Security.Principal.WindowsIdentity.GetCurrent().Name.ToString();

4.System.Environment.UserName;
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Which statement is to be used in which scenario ??
-------
Please explain.

Please give some links/ examples/ explanation...

I have googled it, but no clear idea till date...

Riddhi Valecha · Answer

Hi.. For Single Sign On I am using statement - Page.User.Identity.Name to get the User Name Changed the iis setting - Windows Authentication Enabled = true; ------- My Requirement - 1. I have given a set of users (25 for now) i.e. 25 windows users. 2. My Single Sign On Portal is for these 25 users only. --------- My Query - 1. I have written the following code on Page_Load event - if(Page.Ispostback == false ) { string user = Page.User.Identity.Name.Trim(); //IN//abc.xyz string checkUser = user.Substring(3).ToString().Trim();//abc.xyz if (checkUser is present in the database) { Response.Redirect(Index.aspxfalse); } else { Response.Redirect (Errorpage.aspxfalse); } } ------- Error- Sometimes even if the user is valid the system redirects to error page. When I removed the POstBack Condition - then system redirects to Index Page. Now Postback will be false on page_load everytime. It works fine on local. But it gives error on server. Please give me some ways to detect issues on server.... -------- How to detect this issue?? What should I do ?? Do I need to use any other thing to implement Single Sign ON PLease guide and explain...

Pradeep · Answer

for 2nd point: basicaly you need to enable Integrated windows authentication and the use the following: string strName = HttpContext . Current . User . Identity . Name . ToString (); you still have other methods to get the logged in user name. Now for 3. System.Security.Principal.WindowsIdentity.GetCurrent().Name.ToString(); You will need to configure the application to impersonate the Windows user who is accessing it by adding the following element after the authentication element in the Web.Config: For Example void Authenticate() { string strLogin = null; try { strLogin = System.Security.Principal.WindowsIdentity.GetCurrent().Name; Session.Add(Login strLogin); } catch (Exception ex) { } } For 4.System.Environment.UserName; Gets the user name of the person who is currently logged on to the Windows operating system. For Example: public static void Main() { Console.WriteLine(); // Console.WriteLine( UserName: {0}  Environment.UserName); }

Pradeep · Answer

Hi budy for your 1st Point. Page.User.Identity.Name this wil check the key value which has been given in the webconfig as given below. deny users = me  /> for example if you checking the authentication for page user. public partial class Login : Page { protected void Page_Load ( object sender  EventArgs e ) { } protected void LoggedIn ( object sender  EventArgs e ) { //This is redirect the user to their page switch ( Page . User . Identity . Name . ToLower ()) { case me : Response . Redirect ( ~/me.aspx ); break ; case you : Response . Redirect ( ~/you.aspx ); break ; case them : Response . Redirect ( ~/them.aspx ); break ; } } protected void Unnamed6_Click ( object sender  EventArgs e ) { } } More more details go this link: http://stackoverflow.com/questions/20843573/using-page-user-identity-name-in-login-page