Entity Framework - DbContext SaveChanges() - entity-framework

Question

Can someone tell me is it possible, and if it is how to avoid using two times _context.SaveChanges() in this code?
Message m = new Message
{
Title = message.Title,
Body = message.Body,
Date = DateTime.Now
};
_context.Messages.Add(m);
_context.SaveChanges();
UserMessage messageToUser = new UserMessage
{
MessageID = m.ID,
ProductID = message.ProductID,
SenderID = message.SenderID,
RecieverID = reciever.Id
};
_context.UserMessages.Add(messageToUser);
_context.SaveChanges();
This is how my Entities look like
public class UserMessage
{
public int ID { get; set; }
public string SenderID { get; set; }
public string RecieverID { get; set; }
public int? ProductID { get; set; }
public int MessageID { get; set; }
public User Sender { get; set; }
public User Reciever { get; set; }
public Product Product { get; set; }
public Message Message { get; set; }
}
public class Message
{
public int ID { get; set; }
public string Title { get; set; }
public string Body { get; set; }
public DateTime Date { get; set; }
}

Answer 1

On your UserMessage class, you set the reference instead of the foreign key, as the foreign key is not known yet.
In your code, that would mean:
Message m = new Message
{
Title = message.Title,
Body = message.Body,
Date = DateTime.Now
};
_context.Messages.Add(m);
UserMessage messageToUser = new UserMessage
{
ProductID = message.ProductID,
SenderID = message.SenderID,
RecieverID = reciever.Id,
Message = m
};
_context.UserMessages.Add(messageToUser);
_context.SaveChanges();