Unable to Create/Add Rows in DataTable

Question

I have deserialized a JSON string into a DataSet. I am trying to pull relevant rows from that DataSet and put it into a DataTable. I have followed several examples that I have found on SO, but I am getting an error of Cannot find column 0. I have confirmed that the JSON is deserialized correctly and that the data is I'm trying to pull is there.

Ideally, I'd prefer to have column names, but I received a similar error.

Here is my code

DataTable results = new();
DataRow workrow;

DataSet ds = JsonConvert.DeserializeObject<DataSet>(jsonData);

foreach (DataTable table in ds.Tables)
{
    foreach (DataRow dr in table.Rows)
    {
        Console.WriteLine($"DataRow: {dr["listname"]}");
        if (dr["listname"].ToString() == "ADJREASON")
        {
            Console.WriteLine($"Code: {dr["code"]}");
            Console.WriteLine($"Desc: {dr["description"]}");

            //workrow = results.NewRow();
            //workrow["code"] = dr["code"];
            //workrow["desc"] = dr["description"];
            //results.Rows.Add(workrow);

            workrow = results.NewRow();
            workrow[0] = dr["code"];
            workrow[1] = dr["description"];
            results.Rows.Add(workrow);
        }
    }
}