namespace System.Data
{
    [DefaultMember("Item")]
    [DefaultProperty("ColumnName")]
    [DesignTimeVisible(false)]
    [Editor("Microsoft.VSDesigner.Data.Design.DataColumnEditor, 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")]
    [ToolboxItem(false)]
    public class DataColumn : MarshalByValueComponent
    {
        protected internal void CheckNotAllowNull();
    }
}