private void getOSDetails()
        {

            ManagementObjectSearcher objMOS = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM  Win32_OperatingSystem");

            foreach (ManagementObject objManagemnet in objMOS.Get())
            {
                try
                {
                     using(StreamWriter objStreamWriter = new StreamWriter(@"D:\osDetails.txt"))
                    {
                        objStreamWriter.WriteLine("======================================================================");
                        objStreamWriter.WriteLine("                Operating System Details                                  ");
                        objStreamWriter.WriteLine("======================================================================");

                        objStreamWriter.WriteLine("BootDevice            :" + Convert.ToString(objManagemnet.GetPropertyValue("BootDevice")));
                        objStreamWriter.WriteLine("BuildNumber           :" + Convert.ToString(objManagemnet.GetPropertyValue("BuildNumber")));
                        objStreamWriter.WriteLine("Caption               :" + Convert.ToString(objManagemnet.GetPropertyValue("Caption")));
                        objStreamWriter.WriteLine("CountryCode           :" + Convert.ToString(objManagemnet.GetPropertyValue("CountryCode")));
                        objStreamWriter.WriteLine("Description           :" + Convert.ToString(objManagemnet.GetPropertyValue("Description")));
                        objStreamWriter.WriteLine("InstallDate           :" + Convert.ToString(objManagemnet.GetPropertyValue("InstallDate")));


                        objStreamWriter.WriteLine("LastBootUpTime       :" + Convert.ToString(objManagemnet.GetPropertyValue("LastBootUpTime")));
                        objStreamWriter.WriteLine("Manufacturer         :" + Convert.ToString(objManagemnet.GetPropertyValue("Manufacturer")));
                        objStreamWriter.WriteLine("Name                 :" + Convert.ToString(objManagemnet.GetPropertyValue("Name")));
                        objStreamWriter.WriteLine("NumberOfUsers        :" + Convert.ToString(objManagemnet.GetPropertyValue("NumberOfUsers")));
                        objStreamWriter.WriteLine("Organization         :" + Convert.ToString(objManagemnet.GetPropertyValue("Organization")));
                        objStreamWriter.WriteLine("SerialNumber         :" + Convert.ToString(objManagemnet.GetPropertyValue("SerialNumber")));

                        objStreamWriter.WriteLine("RegisteredUser       :" + Convert.ToString(objManagemnet.GetPropertyValue("RegisteredUser")));
                        objStreamWriter.WriteLine("SystemDirectory      :" + Convert.ToString(objManagemnet.GetPropertyValue("SystemDirectory")));
                        objStreamWriter.WriteLine("SystemDrive          :" + Convert.ToString(objManagemnet.GetPropertyValue("Name")));
                        objStreamWriter.WriteLine("Version              :" + Convert.ToString(objManagemnet.GetPropertyValue("Version")));
                        objStreamWriter.WriteLine("WindowsDirectory     :" + Convert.ToString(objManagemnet.GetPropertyValue("WindowsDirectory")));
                        
                    }
                    
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message.ToString());
                }
            }
            
        
        }