namespace System.Data
{
    [DefaultEvent("CollectionChanged")]
    [DefaultMember("Item")]
    [Editor("Microsoft.VSDesigner.Data.Design.ColumnsCollectionEditor, Microsoft.VSDesigner, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", "System.Drawing.Design.UITypeEditor, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
    public sealed class DataColumnCollection : InternalDataCollectionBase
    {
        [RequiresUnreferencedCode("Members might be trimmed for some data types or expressions.")]
        public DataColumn! Add(string? columnName, [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields | DynamicallyAccessedMemberTypes.PublicProperties)] Type! type, string! expression);
    }
}