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var datatable = DataSetCreator.Create(10, 100);

public static class DataTableCreator
{
	public static DataTable Create(int rowCount, int columnCount)
	{
		var result = new DataTable("DummyTable");
		
		foreach (var column in Enumerable.Range(0, columnCount)) {
			result.Columns.Add("COLUMN_" + column);
		}

		var random = new Random();
		foreach (var row in Enumerable.Range(0, rowCount)) {
			var addRow = result.NewRow();
			foreach (var column in Enumerable.Range(0, columnCount)) {
				addRow[column] = string.Format("DATA_{0}", random.Next(100));
			}
			result.Rows.Add(addRow);
		}
		return result;
	}
}