A C# implementation of Stub for DataTable creation as a test helper.

StubDataTable.cs

using System;
using System.Collections;
using System.Data;

namespace TestDataTableBuilder
{
    class Program
    {
        static void Main(string[] args)
        {
            DataTable dt = new StubDataTable("FirstName", "LastName", "Age")
            {
                { "John", "Doe", 25 },
                { "Jane", "Doe", 24 }
            };
            
            dt.TableName = "Person"; // can't write xml without a name for the table
            dt.WriteXml(Console.Out);
        }
    }

    class StubDataTable : IEnumerable
    {
        private readonly DataTable _table;

        public StubDataTable(params string[] columnNames)
        {
            _table = new DataTable();
            foreach (var columnName in columnNames)
                _table.Columns.Add(columnName);
        }

        public void Add(params object[] values)
        {
            _table.LoadDataRow(values, LoadOption.OverwriteChanges);
        }

        public IEnumerator GetEnumerator()
        {
            throw new NotImplementedException();
        }

        public static implicit operator DataTable(StubDataTable dt)
        {
            return dt._table;
        }
    }
}