protected void UpdateCustomerInstance(String customerID,
	String contactName, String country, String companyName) {
NorthwindDataContext dc = new NorthwindDataContext();

Customer c = dc.Customers.First(c => c.CustomerID == customerID);
if (c != null) {
c.ContactName = contactName;
c.Country = country;
c.CompanyName = companyName;
}

dc.SubmitChanges();
}
