public void xoact(string id)
{
pthuct ct = (from c in db.pthucts select c).Single(x => x.id == id);
db.pthucts.DeleteOnSubmit(ct);
db.SubmitChanges();
}
public void moict(string diengiai, string idcv, string idmuccp, double thanhtien, string idthu, string id, string tiente, double tygia, double nguyente)/* string tk)*/
{
pthuct ct = new pthuct();
ct.diengiai = diengiai;
ct.idcv = idcv;
ct.idmuccp = idmuccp;
ct.thanhtien = thanhtien;
ct.idthu = idthu;
ct.id = id;
ct.tiente = tiente;
ct.tygia = tygia;
ct.nguyente = nguyente;
//ct.tkco = tk;
db.pthucts.InsertOnSubmit(ct);
db.SubmitChanges();
}