Pupli

Put Extra

Intent updateIntent = new Intent(this, typeof(UpdateActivity));
updateIntent.PutExtra("Version", update.LatestVersion);
updateIntent.PutExtra("Url", update.Url);
updateIntent.PutExtra("Length", length);
StartActivity(updateIntent);

GetExtra

protected override void OnCreate(Bundle savedInstanceState)
		{
			base.OnCreate(savedInstanceState);

			SetContentView(Resource.Layout.Update);


		    if (Intent.Extras != null)
		    {
                var version = Intent.Extras.GetString("Version");
                var url = Intent.Extras.GetString("Url");
                var length = Intent.Extras.GetLong("Length");
            }

		}

Download Manager is a System Service that optimises the handling of long-running downloads in the background.

var download =(DownloadManager) GetSystemService(Context.DownloadService);
Android.Net.Uri uri=Android.Net.Uri.Parse(update.Url);
DownloadManager.Request request=new DownloadManager.Request(uri);
var fileName = System.IO.Path.GetFileName(update.Url);
request.SetTitle("Fan Coil").SetDescription(fileName);
request.SetVisibleInDownloadsUi(true);
request.SetNotificationVisibility(DownloadVisibility.VisibleNotifyCompleted);
download.Enqueue(request);
//request.SetAllowedNetworkTypes(DownloadNetwork.Mobile | DownloadNetwork.Wifi);

References :
http://101apps.co.za/articles/using-the-downloadmanager-to-manage-your-downloads.html
http://stackoverflow.com/questions/13349806/why-does-the-download-completed-notification-disappear-on-gingerbread-devices

At a glance:

1 – Add Sqlite.cs to your project.
2 – Add your database file as an Asset.
3 – Set your database file to build as an AndroidAsset.
4 – Manually copy the database file out of your apk to another directory.
5 – Open a database connetion using Sqlite.SqliteConnection.
6 – Operate on the database using Sqlite.

1. Add Sqlite.cs to your project.

2. Add DB as asset.

3. Set DB to build as AndroidAsset.

4. Manually copy DB out of your APK.

string dbName = "db.sqlite";
string dbPath = Path.Combine (Android.OS.Environment.ExternalStorageDirectory.ToString (), dbName);
// Check if your DB has already been extracted.
if (!File.Exists(dbPath))
{
    using (BinaryReader br = new BinaryReader(Assets.Open(dbName)))
    {
        using (BinaryWriter bw = new BinaryWriter(new FileStream(dbPath, FileMode.Create)))
        {
            byte[] buffer = new byte[2048];
            int len = 0;
            while ((len = br.Read(buffer, 0, buffer.Length)) > 0)
            {
                bw.Write (buffer, 0, len);
            }
        }
    }
}

5. Open DB Connection.

using (var conn = new SQLite.SQLiteConnection(dbPath))
{
        // Do stuff here...
}

6. Operate on DB.

References :
http://stackoverflow.com/questions/18715613/use-a-local-database-in-xamarin