Does Entity Framework support Multi-Threading?

I am writing a C# .NET4.5 Console application targeting the Entity Framework 6.1.3. I am using the Unit Of Work paradigm as follows:

public class UnitOfWork : IUnitOfWork, IDisposable
{
    private readonly DataContext _context;
    private readonly List<object> _repositories = new List<object>();
    public UnitOfWork(DataContext context)
    {
        _context = context;
        _context.Configuration.LazyLoadingEnabled = false;
    }

    public IRepository<T> GetRepository<T>() where T : class
    {
        //try to get existing repository
        var repo = (IRepository<T>)_repositories.SingleOrDefault(r => r is IRepository<T>);
        if (repo == null)
        {
            //if not found, create it and add to list
            _repositories.Add(repo = new EntityRepository<T>(_context));
        }
        return repo;
    }

    public int Commit()
    {
        return _context.SaveChanges();
    }


    public bool AutoDetectChanges
    {
        get { return _context.Configuration.AutoDetectChangesEnabled; }
        set { _context.Configuration.AutoDetectChangesEnabled = value; }
    }

And my Repository like this:

   public class EntityRepository<T> : IRepository<T> where T: class 
    {
        protected readonly DbContext Context;
        protected readonly DbSet<T> DbSet;
    public EntityRepository(DbContext context)
    {
        Context = context;            
        DbSet = Context.Set<T>();
    }

    public IQueryable<T> All()
    {
        return DbSet;
    }
    ….. other functions….

    public virtual void Add(T entity)
    {        
        DbEntityEntry dbEntityEntry = Context.Entry(entity);
        if (dbEntityEntry.State != EntityState.Detached)
        {
            dbEntityEntry.State = EntityState.Added;
        }
        else
        {
            DbSet.Add(entity);
        }
    }
    }

I call these like this:

 var rep = _uow.GetRepository<TableOfPies>();
 rep.Add(Pie);
 _uow.Commit();

My Console application has multiple threads, each of which will at some point want to Update / Edit / Add to the same tables in my cloud-based SQL Server database.

I have implemented thread-safe code for my other code using locks but I am not aware of how I can make Entity thread-safe? Right now, I get the following error:

INNER EXCEPTION: New transaction is not allowed because there are other threads running in the session.

I have looked online and have not been able to find much about Entity and multi-threading. I have heard that Entity does not support multi-threaded applications but find that heard to believe. Any pointers would be greatly appreciated.