Relationships between Tables Using Entity Framework

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C#

ASP.NET

WebForms

database

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I'm using Entity Framework for my database in asp.net but when my database is on localhost it automatically add the tables and relationships but after I uploaded my database to host and I tried to use it in model.edmx it add tables without relationships.

I tried to add relationships with the object is in model.edmx but it automatically deleted my model.cs code and then I tried to make their relationships with coding but still not working

This is my code for tables in model.cs

public partial class Cart
{
    public int id { get; set; }
    public string clientId { get; set; }
    public int productId { get; set; }
    public int amount { get; set; }
    public Nullable<System.DateTime> datePurchased { get; set; }
    public bool isInCart { get; set; }

    [InverseProperty("Cart")]
    public virtual Product Product { get; set; }
}

and this one

public partial class Product
{
    public Product()
    {
        this.Carts = new HashSet<Cart>();
    }

    public int id { get; set; }
    public int typeId { get; set; }
    public string name { get; set; }
    public Nullable<double> price { get; set; }
    public string description { get; set; }
    public string image { get; set; }

    [ForeignKey("productId")]
    [InverseProperty("Product")]
    public virtual ICollection<Cart> Carts { get; set; }
}

i want to make a relationships between "id" in table product and "productId" in table cart
how can i do it?
With Respect