How to get the System Information from System Table using C#

I want to know my system information using C# 1. ProcessorId 2. Product 3. Manufacturer 4. Signature 5. Caption 6. PhysicalMedia(SerialNumber) 7. Version 8. OperatingSystem(SerialNumber) just call the method like this:

RunQuery("Processor", "ProcessorId");
RunQuery("BaseBoard", "Product");
RunQuery("BaseBoard", "Manufacturer");
RunQuery("DiskDrive", "Signature");
RunQuery("VideoController", "Caption");
RunQuery("PhysicalMedia", "SerialNumber");
RunQuery("BIOS", "Version");
RunQuery("OperatingSystem", "SerialNumber");

 private static string RunQuery(string TableName, string MethodName)
        {
            ManagementObjectSearcher MOS = new ManagementObjectSearcher("Select * from Win32_" + TableName);
            foreach (ManagementObject MO in MOS.Get())
            {
                try
                {
                    return MO[MethodName].ToString();
                }
                catch (Exception e)
                {
                    System.Windows.Forms.MessageBox.Show(e.Message);
                }
            }
            return "";
        }