How to set single sign on asp.net c#?

Question

i want to set single sign on to application using system user name.

my comuter name is raja and user name is admin

i use many codes

string Domain = System.Net.NetworkInformation.IPGlobalProperties.GetIPGlobalProperties().DomainName;

string Host = System.Net.Dns.GetHostName();

string USER = System.Security.Principal.WindowsIdentity.GetCurrent().Name;

System.Net.IPHostEntry host = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName());

all is working in my local machine fine but i host the application to server the code is does not get the username of local system this is get only hosted name if i host the application name of 'test' the codes get only test.

i want local system name

local system name is 'rjk'

application login to without ask username and password

all of the user have the rjk keyword so

if(LOGIN_USER.Contains("rjk"))
{
//successfully login
}

how to do it.

Nitin Sontakke · Answer

Did you list and see EVERY server variable's value printed on the page?

Nitin Sontakke · Answer

Did you manage to enable Windows Authentication on the web-site? Only Windows Authentication should be enabled everything else should disabled. After that did you manage to list ALL the server variables as suggested on another thread by you? http://www.c-sharpcorner.com/forums/how-to-get-current-pc-username

Raja · Answer

Thank you sir now its working fine

Raja · Answer

Nitin Sontakke i have enable windows authendication is enable another options as disable in my iis 7 but the same problem is occured so only asked again the same question.