int IdClient= Convert.ToInt32(Request.QueryString["ClientID"]);
var query = (from cl in context.clients
Where cl.ClientID==IdClient select cl).SingleOrDefault();
if(query!=null){
query.NumeroIdentificationFiscal = NumIdent.Text;
query.NomProprietaire = Nom.Text;
query.Province = DropDownList5.SelectedValue;
query.NumCNI = cni.Text;
query.CategorieProprietaire = DropDownList1.SelectedValue;
context.SaveChanges();
NumIdent.Text="";
Nom.Text="";
DropDownList5.Text="";
cni.Text="";
DropDownList1.Text="";
}