Public Sub Update

Dim instance As SPList

instance.Update

public void Update ()

Dim webSite As SPWeb = SPContext.Current.Web
Try
    Dim list As SPList = webSite.Lists("List_Name")
    list.EnableAttachments = True
    list.EnableModeration = True
    list.Hidden = True

    list.Update()
Finally
    webSite.Dispose()
End Try

SPWeb oWebsite = SPContext.Current.Web;
SPList oList = oWebsite.Lists["List_Name"];
oList.EnableAttachments = true;
oList.EnableModeration = true;
oList.Hidden = true;
oList.Update();