How to convert this code to LINQ [closed]

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The other answers have shown how you can (and should, IMO) do this without LINQ – but they’ve both still got the same problem that your original code does: you’re only checking whether the data set has any tables – it could have fewer than tableNo tables. I would suggest:

public bool IsNullOrEmptyDataTable(DataSet objDataset, int tableNo)
{
    return objDataset == null ||
           objDataset.Table.Count <= tableNo ||
           objDataset.Tables[tableNo].Rows.Count == 0;
}

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