public Record(string name, string[] columnnames, object[] columnvalues)
{
FlowError.AssertNotNull(name, "name");
FlowError.AssertNotNull(columnnames, "column names");
FlowError.AssertNotNull(columnvalues, "column values");
FlowError.Assert(columnvalues.Length == columnnames.Length, "column names and values different length");
_name = name;
_columnnames = columnnames;
_columnvalues = columnvalues;
}