Public Property CustomMasterUrl As String
Dim instance As SPWeb Dim value As String value = instance.CustomMasterUrl instance.CustomMasterUrl = value
public string CustomMasterUrl { get; set; }
The MasterUrl and CustomMasterUrl properties are both set to "/_catalogs/masterpage/default.master" by default. If you subsequently need to delete the default.master file, you must set both of those properties to a different value. If you set just one of them to a different value, an error is raised that suggests the default.master file is still being used as the master page for the site.
/_catalogs/masterpage/default.master
default.master
Both meeting workspaces and sites using the publishing feature can have different values for these properties. Indeed the meeting workspaces always have different values.
And setting them to different values didn't cause any kind of error.