SPWeb.Provisioned property

Gets a Boolean value that indicates whether the website has been provisioned.

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

public bool Provisioned { get; internal set; }

Property value

Type: System.Boolean
true if the website has been provisioned; otherwise, false.

website creation involves two steps: first you must create the website object, and then you must provision the new website through a site definition or template.