C#

"Error 39  Attribute 'StructLayout' is not valid on this declaration type. It is only valid on 'class, struct' declarations.   D:\visual studio projects\firstCSharp\firstCSharp\settings.cs   16  12  firstCSharp"

public partial class settings : Form
    {
          [StructLayout(LayoutKind.Sequential)]
        [DllImport("kernel32.dll", EntryPoint = "SetSystemTime", SetLastError = true)]

        private static extern bool SetSystemTime(ref MyDateTime st);



        [DllImport("kernel32.dll", EntryPoint = "GetSystemTime", SetLastError = true)]

        private extern static void GetSystemTime(ref MyDateTime sysTime);

<code>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Imapi2
{
    // Declare IRawCDImageTrackInfo as a COM interface which 
    [Guid("56A868B1-0AD4-11CE-B03A-0020AF0BA770"),
    InterfaceType(ComInterfaceType.InterfaceIsDual)]
    interface IRawCDImageTrackInfo    
    {
        
        void get_ISRC(
            [Out,MarshalAs(UnmanagedType.BStr)] string value);
        
        void get_StartingLba();
        void get_SectorCount();
        void get_TrackNumber();
        void get_SectorType();
        void put_ISRC();
        void get_DigitalAudioCopySetting();
        void put_DigitalAudioCopySetting();
        void get_AudioHasPreemphasis();
        void put_AudioHasPreemphasis();
        void get_TrackIndexes();
    }

    // Declare ccIRawCDImageTrackInfo as a COM coclass:
    [ComImport, Guid("56A868B1-0AD4-11CE-B03A-0020AF0BA770")]
    class ccIRawCDImageTrackInfo
    {
    }
}

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Imapi2.ccIRawCDImageTrackInfo ccTest1 =
                    new Imapi2.ccIRawCDImageTrackInfo();
                Imapi2.IRawCDImageTrackInfo test1 =
                    (Imapi2.IRawCDImageTrackInfo)ccTest1;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Unexpected COM exception: " + ex.Message);
            }
            Wait for completion. 
            Console.WriteLine("Press Enter to continue.");
            Console.ReadLine();
        }
    }
}
</code>

private void timerCheckUpdates_Tick(object sender, EventArgs e)
{
    if (ApplicationDeployment.IsNetworkDeployed)
    {
        if (!CheckUpdate)
        {
            ApplicationDeployment ad = ApplicationDeployment.CurrentDeployment;

            try
            {
                ad.CheckForUpdateCompleted += new CheckForUpdateCompletedEventHandler(ad_CheckForUpdateCompleted);
                ad.CheckForUpdateAsync();
                CheckUpdate = true;
            }
            catch (COMException)
            {
                ad.CheckForUpdateAsyncCancel();
            }
        }
    }
}

void ad_CheckForUpdateCompleted(object sender, CheckForUpdateCompletedEventArgs e)
{
    CheckUpdate = false;
    if (e.UpdateAvailable)
    {
        notifyIcon1.ShowBalloonTip(5000, "Update Available!", "There is a new update available for this application!\nPlease click on the Help menu and click Check for updates.", ToolTipIcon.Info);
        timerCheckUpdates.Enabled = false;
    }
}