public class CompanyOperationRepo  

{  

    efDBEntities _db = new efDBEntities();  

    public Boolean InsertCompany(Company tmpcompany)  

    {  

        if (tmpcompany.company_name != null)  

        using (_db)  

        {  

            _db.company.Add(tmpcompany);  

            _db.SaveChanges();  

             return true;  

        }  

        throw new ArgumentException();  

    }  

}

​

public class CompanyLogic

{  

    CompanyOperationRepo companyRepo = null;  

    public CompanyLogic(CompanyOperationRepo tempCompanyRepo)  

    {  

        this.companyRepo = tempCompanyRepo;  

    }

    public Boolean InsertCompany(Company company)  

    {  

        return companyRepo.InsertCompany(company);  

    }  

}