var dbFolder = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
 var fileName = "dbappoitnemtns.db";
 var dbFullPath = Path.Combine(dbFolder, fileName);
 try
   {
      using (var db = new BookingContext(dbFullPath))
      {
         await db.Database.MigrateAsync(); //We need to ensure the latest Migration was added. This is different than EnsureDatabaseCreated.

       Appointments _appTestDate1 = new Appointments() { Subject="Test Appointment
     1",StarDate=DateTime.Now,EndDate=DateTime.Now.AddHours(2),isActive=true };

      }
      catch (Exception ex)
     {
           System.Diagnostics.Debug.WriteLine(ex.ToString());
      }

using BookingDataAccess.Models;
using Microsoft.EntityFrameworkCore;

namespace BookDataContext
{
   public class BookingContext : DbContext
{
    public DbSet<Appointments> Appointment { get; set; }

    private string DatabasePath { get; set; }

    public BookingContext()
    {

    }

    public BookingContext(string databasePath)
    {
        DatabasePath = databasePath;
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlite($"Filename={DatabasePath}");
    }
 }
}

<ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore">
      <Version>2.0.2</Version>
    </PackageReference>
    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite.Core">
      <Version>2.0.2</Version>
    </PackageReference>
    <PackageReference Include="Xamarin.Android.Support.v7.AppCompat" Version="25.*" />
  </ItemGroup>