Retrieving Current Users E-mail Address from Active Directory

public string GetEmail()

{

    //add using statement for System.Security.Principal

    //Retrieve Sid of currently logged in user

    WindowsIdentity user = WindowsIdentity.GetCurrent();

    SecurityIdentifier userSid = user.User;

    //Create LDAP path to user with Sid

    string adPath = String.Format(

        "LDAP://", userSid);

    //Create DE object

    DirectoryEntry sidBind = new DirectoryEntry(

        adPath,

        null,

        null,

        AuthenticationTypes.Secure);

    //retrieve e-mail address property

    if (sidBind.Properties.Contains("mail"))

    {

        return sidBind.Properties["mail"].Value.ToString();

    }

    else

    {

        return String.Empty;

    }

}