public void InsertTable(string firstName)
{
LinqPracDBDataContext pracDb = new LinqPracDBDataContext();
t1 t = new t1();
t.firstName = firstName;
pracDb.t1s.InsertOnSubmit(t);
pracDb.SubmitChanges();
}
partial void Deletet1(t1 instance);
partial void Updatet1(t1 instance);
partial void Insertt1(t1 instance);