Environment.UserName returning application pool name instead of username

Try something like this:

if (System.Web.HttpContext.Current.User.Identity.IsAuthenticated)
{
   string username = System.Web.HttpContext.Current.User.Identity.Name;
}

Important note: You need to configure IIS to enable integrated security and disable anonymous logon.

Note that Environment.Username returns the Username on the current Thread.

Try using

Request.ServerVariables["LOGON_USER"]

It will return DOMAIN\USERNAME. You can then split it etc.

This worked for me. Use Environment.GetEnvironmentVariable("USERNAME") for current Login username.

Link :https://www.c-sharpcorner.com/uploadfile/puranindia/the-environment-class-in-C-Sharp/

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