DataSet dataSet = new DataSet("dataSet");
dataSet.Namespace = "NetFrameWork";
DataTable table = new DataTable();
DataColumn idColumn = new DataColumn("id", typeof(int));
idColumn.AutoIncrement = true;
DataColumn itemColumn = new DataColumn("item");
table.Columns.Add(idColumn);
table.Columns.Add(itemColumn);
dataSet.Tables.Add(table);
for (int i = 0; i < 2; i++)
{
    DataRow newRow = table.NewRow();
    newRow["item"] = "item " + i;
    table.Rows.Add(newRow);
}
dataSet.AcceptChanges();
string json = JsonConvert.SerializeObject(dataSet, Formatting.Indented);
Console.WriteLine(json);
 
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