After the VS 2003 creates a strongly typed DataSet object that contains a
couple of tables and serveral many-to-may data relations among all the
tables, and the data got populated, I am wonder how the DataRelation object
of the DataSet object is updated when some new rows are added to some of the
tables. Do I have to update the relation of the added rows or in somewhere
the relations are added automatically? Can someone explain this for me or
point me to some resources?

Thanks a lots.

hi,

What do you mean by updating the relation?

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
www.rthand.com
Blog: http://cs.rthand.com/blogs/blog_with_righthand/
SLODUG - Slovene Developer Users Group www.codezone-si.info

"DHuang" <(E-Mail Removed)> wrote in message
news:21F5BC51-5C60-4131-854E-(E-Mail Removed)...
> After the VS 2003 creates a strongly typed DataSet object that contains a
> couple of tables and serveral many-to-may data relations among all the
> tables, and the data got populated, I am wonder how the DataRelation
> object
> of the DataSet object is updated when some new rows are added to some of
> the
> tables. Do I have to update the relation of the added rows or in somewhere
> the relations are added automatically? Can someone explain this for me or
> point me to some resources?
>
> Thanks a lots.
>

Say, I have two related tables that are populated to a stringly typed DataSet
object (created by Visual Studio 2003), including their relationship (foreign
key). So that I have a DataSet object that contains two DataTable objects and
at least a DataRelationCollection object, and some others. If I add two new
and related rows, one to each table, I expect that a new relation object is
add autmoatically to the DataRelationCollection object by some mechanism also
generated the VS 2003, but not by some logics that have to be written by
myself. I just want to confirm this because I could not find an explanation
of how to handle data relation within (strongly typed) DataSet from MSDN
library. Did I explain this clearly? Thanks.

"Miha Markic [MVP C#]" wrote:

> hi,
>
> What do you mean by updating the relation?
>
> --
> Miha Markic [MVP C#] - RightHand .NET consulting & development
> www.rthand.com
> Blog: http://cs.rthand.com/blogs/blog_with_righthand/
> SLODUG - Slovene Developer Users Group www.codezone-si.info
>
> "DHuang" <(E-Mail Removed)> wrote in message
> news:21F5BC51-5C60-4131-854E-(E-Mail Removed)...
> > After the VS 2003 creates a strongly typed DataSet object that contains a
> > couple of tables and serveral many-to-may data relations among all the
> > tables, and the data got populated, I am wonder how the DataRelation
> > object
> > of the DataSet object is updated when some new rows are added to some of
> > the
> > tables. Do I have to update the relation of the added rows or in somewhere
> > the relations are added automatically? Can someone explain this for me or
> > point me to some resources?
> >
> > Thanks a lots.
> >
>
>
>

"DHuang" <(E-Mail Removed)> ha scritto nel messaggio
news:9226A749-DD2B-40BA-847B-(E-Mail Removed)...

> Say, I have two related tables that are populated to a stringly typed
> DataSet
> object (created by Visual Studio 2003), including their relationship
> (foreign
> key). So that I have a DataSet object that contains two DataTable objects
> and
> at least a DataRelationCollection object, and some others. If I add two
> new
> and related rows, one to each table, I expect that a new relation object
> is
> add autmoatically to the DataRelationCollection object by some mechanism
> also
> generated the VS 2003, but not by some logics that have to be written by
> myself. I just want to confirm this because I could not find an
> explanation
> of how to handle data relation within (strongly typed) DataSet from MSDN
> library. Did I explain this clearly? Thanks.

A DataRelation object links two tables, not their rows one-by-one. You must
not add new DataRelations everytime you add a row to a table.

Massimo