Get server data cpu serial and date

It looks to me like you are on the right track. It is just a matter of determining which pieces to query.

This can be improved on, but its a start:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Management;
using System.IO;

namespace ConsoleApp2
{
    class Program
    {
        public static bool GetComputerInfo(string machine, string win32object, string attributename)
        {
            bool bReturnValue = true;

            try
            {
                // Use the Storage management scope
                ManagementScope scope = new ManagementScope($@"\\{machine}\ROOT\cimv2");  
                // Define the query
                ObjectQuery query = new ObjectQuery($"SELECT * FROM {win32object}");
                // create the search
                ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
                //get a collection of WMI objects
                ManagementObjectCollection queryCollection = searcher.Get();

                //enumerate the collection.
                foreach (ManagementObject m in queryCollection)
                {
                    // access properties of the WMI object
                    Console.WriteLine($"{attributename} : {m[attributename]}");

                }


            }
            catch(Exception ex)
            {
                Console.WriteLine($"{ex.Message}\n{ex.InnerException}\n{ex.StackTrace}");
                bReturnValue = false;
            }
            return bReturnValue;
        }        

        static void Main(string[] args)
        {
            // could make machine a command line arg
            string sTargetMachine = "localhost";    // <-- put target machine name here

            GetComputerInfo(sTargetMachine, "win32_ComputerSystemProduct", "IdentifyingNumber");
            GetComputerInfo(sTargetMachine, "win32_bios", "SerialNumber");
            GetComputerInfo(sTargetMachine, "win32_LocalTime", "Year");
            GetComputerInfo(sTargetMachine, "win32_LocalTime", "Month");
            GetComputerInfo(sTargetMachine, "win32_LocalTime", "Day");
            GetComputerInfo(sTargetMachine, "win32_LocalTime", "Hour");
            GetComputerInfo(sTargetMachine, "win32_LocalTime", "Minute");
            GetComputerInfo(sTargetMachine, "win32_LocalTime", "Second");

            Console.ReadLine();
        }
    }
}

Some other things I found useful while working on this, fire up Powershell

in powershell run the following to get a list of what is out there and queryable

get-wmiobject -List

Then based on what class / object you want to retrieve you can easily look at the available attributes, for example

PS> get-wmiobject win32_ComputerSystemProduct

IdentifyingNumber : XXXXXXX
Name              : Latitude XXXX
Vendor            : Dell Inc.
Version           :
Caption           : Computer System Product