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Editorial Team
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Asked: 2026-05-15T19:53:05+00:00

I have recently started .NET programming, and looked at both VB.NET and C#. In

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I have recently started .NET programming, and looked at both VB.NET and C#.
In VB.NET, a strongly typed Datatable cosisted of a collection of strongly types rows. Therefore, for example, this statement would work:

lCustomerTable As CustomerDataSet.CustomerTable 
lCustomerRow as CustomerDataSet.CustomerTable.CustomerRow

lCustomerTable = TableAdapter.GetData
lCustomerRow = lCustomerTable.Rows(0)

However in C#, it seems i have to explicitly cast the returned Row to a CustomerRow:

lCustomerRow = (CustomerDataSet.CustomerTable.CustomerRow)lCustomerTable.Rows[0]

Is there any reason for this? Should the dataset not create the object type definitions when creating the table adapters and SQL dataTables?

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1 Answer

  1. Editorial Team

    I don’t think Rows is actually strongly typed, even for typed datasets. The difference is that VB, by default, permits implicit downcasts. E.g. you can write:

    Dim o As Object = ""
Dim s As String
s = o  ' implicit downcast from Object to String!

    This is only disabled if you use Option Strict – try that in VB and see if your code still compiles…

    In C#, the downcasts must always be explicit – it doesn’t have a “non-strict mode”.

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