//metodo Eliminar
public void Eliminar()
{
try
{
using (var db = new Model_Sistema())
{
db.Entry(this).State = EntityState.Deleted;
db.SaveChanges();
}
}
catch (Exception ex)
{
throw;
}
}
//metodo guardar
public void Guardar()//retorna solo un objeto
{
try
{
using (var db = new Model_Sistema())
{
if (this.semestre_id > 0)
{
//si existe un valor mayor a 0 es porque existe un registro
db.Entry(this).State = EntityState.Modified;
}
else
{
//si no existe registro graba(nuevo registro)
db.Entry(this).State = EntityState.Added;
}
db.SaveChanges();
}
}
catch (Exception ex)
{
throw;
}
}