namespace System.Data
{
    [DefaultEvent("CollectionChanged")]
    [DefaultMember("Item")]
    [Editor("Microsoft.VSDesigner.Data.Design.ColumnsCollectionEditor, Microsoft.VSDesigner, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
    public sealed class DataColumnCollection : InternalDataCollectionBase
    {
        public DataColumn Add(string columnName, Type type, string expression);
    }
}