Gets the collection of all site collections in the Web application.
Namespace:  Microsoft.SharePoint.Administration
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Syntax
Public ReadOnly Property Sites As SPSiteCollection
    Get
Dim instance As SPWebApplication
Dim value As SPSiteCollection
value = instance.Sites
public SPSiteCollection Sites { get; }
Property Value
Type: Microsoft.SharePoint.Administration.SPSiteCollection
An SPSiteCollection object that represents the collection of site collections.