Split a DataTable into 2 or more DataTables based on Column value

Use LINQ to DataTable to group the first column by GroupBy, and use method CopyToDataTable to copy list of rows to DataTable

 List<DataTable> result = DTHead.AsEnumerable()
            .GroupBy(row => row.Field<int>("MIVID"))
            .Select(g => g.CopyToDataTable())
            .ToList();

Then you can get the result as a list of DataTables as you expected.