Get Windows Login and Logoff time in C# Windows application

Seems you have asked this question in past.

yeah but some one mark as answered and i have not got it till yet

string machineName = WindowsIdentity.GetCurrent().Name.Split('\\')[0];
            PrincipalContext c = new PrincipalContext(ContextType.Machine, machineName);
            //Specific User
         1   UserPrincipal uc = UserPrincipal.FindByIdentity(c, "Rashid");
           2 DateTime? LoggedInTime = uc.LastLogon;

            //Current LoggedIn User
3            uc = UserPrincipal.FindByIdentity(c, userName);
  4          DateTime? CurrentUserLoggedInTime = uc.LastLogon;
 above 4 steps displaying nothing

This steps will not display as they are not set to any Label or TextBox.

I already explained in the last question that you need to display in Label. So Set the variable values on Label to display it on Form

label1.Text = WindowsIdentity.GetCurrent().Name.Split('\\')[1];
            label2.Text = WindowsIdentity.GetCurrent().Name.Split('\\')[0];
            string userName = WindowsIdentity.GetCurrent().Name.Split('\\')[1];
            string machineName = WindowsIdentity.GetCurrent().Name.Split('\\')[0];
            PrincipalContext c = new PrincipalContext(ContextType.Machine, machineName);
            //Specific User
            UserPrincipal uc = UserPrincipal.FindByIdentity(c, "Rashid");
            DateTime? LoggedInTime = uc.LastLogon;

            //Current LoggedIn User
            uc = UserPrincipal.FindByIdentity(c, userName);
            DateTime? CurrentUserLoggedInTime = uc.LastLogon;
            label3.Text = uc;

 This are my steps.