ComputerInfo.cs

using System;
using System.Collections.Generic;
using System.Management;

var consulta = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");
ManagementObjectCollection bios = consulta.Get();

foreach (ManagementObject obj in bios) {
    var item = new Win32_BIOS();
    item.BiosCharacteristics = (ushort[])obj["BiosCharacteristics"];
    item.BIOSVersion = (string[])obj["BIOSVersion"];
    item.BuildNumber = (string)obj["BuildNumber"];
    item.Caption = (string)obj["Caption"];
    item.CodeSet = (string)obj["CodeSet"];
    item.CurrentLanguage = (string)obj["CurrentLanguage"];
    item.Description = (string)obj["Description"];
    item.IdentificationCode = (string)obj["IdentificationCode"];
    item.InstallableLanguages = (ushort?)obj["InstallableLanguages"];
    item.InstallDate = (DateTime?)obj["InstallDate"];
    item.LanguageEdition = (string)obj["LanguageEdition"];
    item.ListOfLanguages = (string[])obj["ListOfLanguages"];
    item.Manufacturer = (string)obj["Manufacturer"];
    item.Name = (string)obj["Name"];
    item.OtherTargetOS = (string)obj["OtherTargetOS"];
    item.PrimaryBIOS = (bool?)obj["PrimaryBIOS"];
    item.ReleaseDate = (string)obj["ReleaseDate"];
    item.SerialNumber = (string)obj["SerialNumber"];
    item.SMBIOSBIOSVersion = (string)obj["SMBIOSBIOSVersion"];
    item.SMBIOSMajorVersion = (ushort?)obj["SMBIOSMajorVersion"];
    item.SMBIOSMinorVersion = (ushort?)obj["SMBIOSMinorVersion"];
    item.SMBIOSPresent = (bool?)obj["SMBIOSPresent"];
    item.SoftwareElementID = (string)obj["SoftwareElementID"];
    item.SoftwareElementState = (ushort?)obj["SoftwareElementState"];
    item.Status = (string)obj["Status"];
    item.TargetOperatingSystem = (ushort?)obj["TargetOperatingSystem"];
    item.Version = (string)obj["Version"];
}

//https://pt.stackoverflow.com/q/55403/101