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04.11.2008 at 12:36PM PDT, ID: 23316251
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The datatable.Rows.Contains() method does not find primary key

Asked by bd9000 in Microsoft Visual Basic.Net, .NET Framework 2.0

Tags: VB.NET ASP.NET 2

The datatable.Rows.Contains() method does not find the primary key value in the datatable and it definitely exists in the table.
I populated a datatable with a single column of values using a datareader, then set the PrimaryKey to column(0), the only column in the DataTable.   The values are there, for sure (64 rows X 1 column), in the datatable, but the statement

If dtProdImportFields.Rows.Contains("ProductName") Then
'do something
End If

does not work at all (the Contains function completely ignores the value passed to it Or I am not using it correctly).   The string "ProductName" is in the datatable and it is the PrimaryKey column and all values are unique, so I am stumped as to what may be going on.

Attached, is the code that generates the datatable (I think the problem may be that the PrimaryKey is somehow not being generated - though there are no errors)

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Protected Sub GetProdImportFields(ByRef dtbl As DataTable)
        Dim sqlstring As String = "SELECT SSFieldName FROM ProdImportFields"
        Using connection As New SqlConnection(DBconnstr)
            connection.Open()
            Using command As New SqlCommand(sqlstring, connection)
                Using reader As SqlDataReader = command.ExecuteReader()
                    dtbl.Load(reader, LoadOption.OverwriteChanges)
                End Using
            End Using
        End Using
        dtbl.PrimaryKey = New DataColumn() {dtbl.Columns(0)} 'this appears correct
    End Sub
[+][-]04.11.2008 at 12:43PM PDT, ID: 21337522

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[+][-]04.11.2008 at 12:45PM PDT, ID: 21337539

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[+][-]04.11.2008 at 12:48PM PDT, ID: 21337559

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[+][-]04.11.2008 at 12:50PM PDT, ID: 21337586

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[+][-]04.11.2008 at 12:59PM PDT, ID: 21337677

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[+][-]04.11.2008 at 01:00PM PDT, ID: 21337687

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[+][-]04.11.2008 at 01:03PM PDT, ID: 21337721

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About this solution

Zones: Microsoft Visual Basic.Net, .NET Framework 2.0
Tags: VB.NET ASP.NET 2
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Solution Provided By: VBRocks
Participating Experts: 1
Solution Grade: A
 
 
[+][-]04.11.2008 at 01:12PM PDT, ID: 21337805

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[+][-]04.11.2008 at 01:16PM PDT, ID: 21337832

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