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I want to grouping fields in crystal reports programatically using vb.net for dynamic reports generation.

I am using vb.net 2005. i am trying to set report groupings of a crystal report at runtime based on user defined options. MSDN says this:

Dim FieldDef As FieldDefinition FieldDef = Report.Database.Tables.Item(0).Fields.Item(comboBox1().Text) Report.DataDefinition.Groups.Item(0).ConditionField = FieldDef

but error shows invalid group number

how to solve this?