SPList.EnableVersioning property

Gets or sets a Boolean value that specifies whether versioning is enabled for the document library.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

public bool EnableVersioning { get; set; }

Property value

Type: System.Boolean
true if versioning is enabled; otherwise, false.

The EnableVersioning property is defined on the SPList class. It can be set to true or false for most SharePoint Lists, with a few exceptions, including survey list and external list.