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CurrentPage.Property["PageChildOrder"]
.
Also, if you need it, the property that corresponds to "Sort Index" in edit mode is named "PagePeerOrder".
/Mark
CurrentPage.Property["PageChildOrder"]
will give you an int that corresponds to the EPiServe.Filters.FilterSortOrder that Frank mentioned.
I tried the following variation to the Sort order
pageListDataControl.SortOrder = (EPiServer.Filters.FilterSortOrder)Enum.Parse(typeof(EPiServer.Filters.FilterSortOrder), CurrentPage["PageChildOrderRule"].ToString());