Check dataset is empty or not

In my opinion the 'right' way is to check both:

ds2.Tables.Count 

ds2.Tables[0].Rows.Count

I'd try check for:
ds2.HasChanges()
It should be true if any data has been added. For further information check here.

You can use bool and return true. For all tables in dataset

bool IsEmpty(DataSet dataSet)
{
    foreach(DataTable table in dataSet.Tables)
    if (table.Rows.Count != 0) return false;

    return true;
}

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