Hi
I have an application that has in memory tables which are related. I
have recently upgraded to 2003 MSDN - which seems to have thrown an
error which I did not have before.

Here is the scenario...

First I build a couple of simple tables:

__________________________________________________

 Dim new_relation As DataRelation
        ' make the tables
        mLanguagesTable = MakeLanguagesTable()
        mLanguageDS.Tables.Add(mLanguagesTable)

        mTermDefinitionsTable = MakeDefinitionsTable("TermDefinitions")
        mLanguageDS.Tables.Add(mTermDefinitionsTable)

        ' add relations
        new_relation = New DataRelation("LanguageTerms",
mLanguagesTable.Columns(0), mTermDefinitionsTable.Columns(0))

        mLanguageDS.Relations.Add(new_relation)

______________________________________________________

I then bind the tables to controls on the form....

The LanguagesTable to a list box..
______________________________________________________

        Me.ListLanguages.DataSource =
Filemanager.Instance.OntologyManager.LanguagesTable

        Me.ListLanguages.DisplayMember = "Language"
        Me.ListLanguages.ValueMember = "id"
______________________________________________________

And then the relation to a Grid..

        Me.DataGridDefinitions.DataSource =
Filemanager.Instance.OntologyManager.LanguagesTable

        Me.DataGridDefinitions.DataMember = "LanguageTerms"
___________________________________________________________

This works, that is the application works fine - but if I set the
exception handling to stop at the error, I now see errors when doing
this binding (out of range exception) and when adding new rows to the
languages table.

The point is that the application works fine, and if I leave errors to
be handled in debug mode, I would not know there is a problem.

Just to make sure the make table routine is OK....
_______________________________________________________
  Private Function MakeLanguagesTable() As DataTable
        ' Create a new DataTable titled 'Languages'
        Dim LangTable As DataTable = New DataTable("Languages")
        ' Add two column objects to the table.
        'First the language ID = two letter ISO code
        Dim idColumn As DataColumn = New DataColumn
        idColumn.DataType = System.Type.GetType("System.String")
        idColumn.ColumnName = "id"
        LangTable.Columns.Add(idColumn)
        'Second the language text from windows/ISO list
        Dim LanguageColumn As DataColumn = New DataColumn
        LanguageColumn.DataType = System.Type.GetType("System.String")
        LanguageColumn.ColumnName = "Language"
        LangTable.Columns.Add(LanguageColumn)
        ' Create an array for DataColumn objects.
        Dim keys(0) As DataColumn
        keys(0) = idColumn
        LangTable.PrimaryKey = keys
        ' Return the new DataTable.
        Return LangTable
    End Function
_________________________________________________________

Cheers, Sam