Emp emp = new Emp();
emp.EmpName = txtName.Text;
emp.Id = Convert.ToInt32(txtId.Text);
EMpSecond sec = new EMpSecond();
sec.EmpAge = Convert.ToInt32(txtAge.Text);
sec.Id = Convert.ToInt32(txtId.Text);
using (TestEntities testEntities = new TestEntities())
{
testEntities.AddToEmps(emp);
testEntities.SaveChanges();
sec.Id = emp.Id;
testEntities.AddToEMpSeconds(sec);
testEntities.SaveChanges();
}