Convert datatable rows into a list of XML strings

ExtensionMethods.cs

using System.Data;

namespace QueryToXml.Lib.Extensions
{
    public static class ExtensionMethods
    {
        public static string[] ColumnNames(this DataTable dataTable)
        {
            var columns = new string[dataTable.Columns.Count];
            for (var c = 0; c < dataTable.Columns.Count; c++)
                columns[c] = dataTable.Columns[c].ColumnName;

            return columns;
        }
    }
}

Parser.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using QueryToXml.Lib.Extensions;

namespace QueryToXml.Lib
{
    public class Parser : IDisposable
    {
        public ICollection<string> Items { get; private set; }
        public DataTable Source { get; private set; }
        private string[] Columns { get; set; }

        public Parser(DataTable source)
        {
            if (string.IsNullOrEmpty(source.TableName))
                throw new InvalidDataException("No table name found on data table");

            Source = source;
            Columns = Source.ColumnNames();
        }

        public ICollection<string> Parse()
        {
            Items = new List<string>();

            if (Columns.Length == 0)
                throw new InvalidDataException("No columns found");

            foreach (DataRow row in Source.Rows)
            {
                var sb = new StringBuilder();

                sb.AppendLine(string.Concat("<", Source.TableName, ">"));
                for (var c = 0; c < Columns.Length; c++)
                    sb.AppendLine(string.Format("<{0}>{1}</{0}>", Columns[c], row[c]));
                sb.AppendLine(string.Concat("</", Source.TableName, ">"));
                
                Items.Add(sb.ToString());
            }

            return Items;
        }

        public void Dispose()
        {
            GC.SuppressFinalize(this);
        }
    }
}