Since there is no DataTable in Silverlight I’ve created small class that can be used to generate columns and rows in runtime in similar to the real DataTable way:

using System;
using System.Windows;
using SilverlightDataTable.DataTable;

namespace SilverlightDataTable
{
    public partial class MainPage
    {
        string[] _names = new string[] { "Côte de Blaye", "Boston Crab Meat", 
            "Singaporean Hokkien Fried Mee", "Gula Malacca", "Rogede sild", 
            "Spegesild", "Zaanse koeken", "Chocolade", "Maxilaku", "Valkoinen suklaa" };
        decimal[] _prizes = new decimal[] { 23.25M, 9.00M, 45.60M, 32.00M, 
            14.00M, 19.00M, 263.50M, 18.40M, 3.00M, 14.00M };
        bool[] _bools = new bool[] { true, false, true, false, true, false, true, false, true, false };
        DataTable.DataTable _table = null;

        private readonly Random _rnd = new Random();

        public MainPage()
        {
            InitializeComponent();
            Loaded += Page_Loaded;
        }
       private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            _table = new DataTable.DataTable();
            _table.Columns.Add(new DataColumn() { ColumnName = "ID", DataType = typeof(int) });
            _table.Columns.Add(new DataColumn() { ColumnName = "Name", DataType = typeof(string) });
            _table.Columns.Add(new DataColumn() { ColumnName = "UnitPrice", DataType = typeof(decimal) });
            _table.Columns.Add(new DataColumn() { ColumnName = "Date", DataType = typeof(DateTime) });
            _table.Columns.Add(new DataColumn() { ColumnName = "Discontinued", DataType = typeof(bool) });

            for (int i = 0; i < 5; i++)
            {
                var row = _table.NewRow();
                row["ID"] = i;
                row["Name"] = _names[_rnd.Next(9)];
                row["UnitPrice"] = _prizes[_rnd.Next(9)];
                row["Date"] = DateTime.Now.AddDays(i);
                row["Discontinued"] = _bools[_rnd.Next(9)];
                _table.Rows.Add(row);
            }


            DataContext = _table;
        }

        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            var table = (DataTable.DataTable)DataContext;

            var row = table.NewRow();
            row["ID"] = table.Rows.Count;
            row["Name"] = _names[_rnd.Next(9)];
            row["UnitPrice"] = _prizes[_rnd.Next(9)];
            row["Date"] = DateTime.Now.AddDays(table.Rows.Count);
            row["Discontinued"] = _bools[_rnd.Next(9)];
            table.Rows.Add(row);
        }

        private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            var table = (DataTable.DataTable)DataContext;
            table.Rows.Remove(table.Rows[dataGrid1.SelectedIndex]);
        }
    }
}

 I have attached the sample application.

SilverlightDataTable.zip (253.24 kb)