using System.Data.Entity;

namespace CommonLibrary.Database
{
    public abstract class DbContextLocator<TContext> where TContext : DbContext, new()
    {
        private TContext _dbContext;

        public TContext Current
        {
            get { return _dbContext; }
        }

        public DbContextLocator()
        {
            _dbContext = GetNew();
        }

        public virtual void Reset()
        {
            _dbContext.Dispose();
            _dbContext = GetNew();
        }

        protected virtual TContext GetNew()
        {
            return Activator.CreateInstance<TContext>();
        }
    }
}

//Concrete class
using System.Data.Entity;
using CommonLibrary.Database;
using ExperimentBase.EntityModels;

namespace MainProject.Models
{
    public class MainDbContextLocator : DbContextLocator<MainDbContext>    {    }
}