public override void Down()
{
DropIndex("UserRoles", new[] { "Role_Id" });
DropIndex("UserRoles", new[] { "User_Id" });
DropForeignKey("UserRoles", "Role_Id", "Roles");
DropForeignKey("UserRoles", "User_Id", "Users");
DropTable("UserRoles");
DropTable("Users");
DropTable("Roles");
}