How to check if operating system is 64 bit or 32 bit in c#.Net?

In windows application I want to check the OS is 64bit OS or 32bit OS. For that the below C#.NET code will help you to know how to check in the coding. There have two different in one is OS and another one is Processor. Some time we need to check the processor is 64bit or not. But some time we need to check the Operating system is 64bit or not. Both are different concept. In 64bit Process some time we will install the 32 OS. For that the below sample code will tell you the processor and OS type.

[DllImport("kernel32", SetLastError = true, CallingConvention = CallingConvention.Winapi)]

        public extern static IntPtr LoadLibrary(string libraryName);

        [DllImport("kernel32", SetLastError = true, CallingConvention = CallingConvention.Winapi)]

        public extern static IntPtr GetProcAddress(IntPtr hwnd, string procedureName);

        private delegate bool IsWow64ProcessDelegate([In] IntPtr handle, [Out] out bool isWow64Process);

        public static bool IsOS64Bit()

        {

            if (IntPtr.Size == 8 || (IntPtr.Size == 4 && Is32BitProcessOn64BitProcessor()))

            {

                return true;

            }

            else

            {

                return false;

            }

        }

        private static IsWow64ProcessDelegate GetIsWow64ProcessDelegate()

        {

            IntPtr handle = LoadLibrary("kernel32");

            if (handle != IntPtr.Zero)

            {

                IntPtr fnPtr = GetProcAddress(handle, "IsWow64Process");

                if (fnPtr != IntPtr.Zero)

                {

                    return (IsWow64ProcessDelegate)Marshal.GetDelegateForFunctionPointer((IntPtr)fnPtr, typeof(IsWow64ProcessDelegate));

                }

            }

            return null;

        }

        private static bool Is32BitProcessOn64BitProcessor()

        {

            IsWow64ProcessDelegate fnDelegate = GetIsWow64ProcessDelegate();

            if (fnDelegate == null)

            {

                return false;

            }

            bool isWow64;

            bool retVal = fnDelegate.Invoke(Process.GetCurrentProcess().Handle, out isWow64);

            if (retVal == false)

            {

                return false;

            }

            return isWow64;

        }

The above example I have explained three type of method to get the result. One is get the OS version you need to use IsOS64Bit() Method will return True/False result. The second function GetIsWow64ProcessDelegate() will return the processer information.