Dim db As New Northwnd("...")

' Create, update, delete code.

db.SubmitChanges(ConflictMode.FailOnFirstConflict)
' or
db.SubmitChanges(ConflictMode.ContinueOnConflict)

Northwnd db = new Northwnd("...");

// Create, update, delete code.

db.SubmitChanges(ConflictMode.FailOnFirstConflict);
// or
db.SubmitChanges(ConflictMode.ContinueOnConflict);