Entities in 'knowitCVdbEntities.EMPLOYEE_LANGUAGES' participate in
the 'FK_EMPLOYEE_LANGUAGES_EMPLOYEES' relationship. 0 related 'EMPLOYEES' were found.

1 'EMPLOYEES' is expected. 

public void setEmployee(string fileName)
    {

        var emp = new EMPLOYEE
                      {
                          firstname = TextBoxFirstName.Text,
                          lastname = TextBoxLastName.Text,
                          about = TextBoxAboutYou.Text,
                          phone = TextBoxPhone.Text,
                          position = TextBoxPosition.Text,
                          email = TextBoxEmail.Text,
                          username = TextBoxUsername.Text,
                          date_of_birth = TextBoxDateOfBirth.Text,
                          image = FileUploadPicture.FileName
                      };
        var emplanguages = new EMPLOYEE_LANGUAGES();
        {
            emplanguages.language_name = ListBoxLanguages.Text;
            
        }

       

        var db = new knowitCVdbEntities();
        db.AddToEMPLOYEES(emp);
        db.AddToEMPLOYEE_LANGUAGES(emplanguages);
        db.SaveChanges();
}