AutoCAD Civil 3D :: Corridor Target Assigning

I want to programmatically assign Targets to subassembly of baseline Regions but I could not Success in that here it is the code

Corridor corridor = ts.GetObject(icor.ObjectId, OpenMode.ForWrite) as Corridor; foreach (Baseline b in corridor.Baselines) { al = ts.GetObject(b.AlignmentId, OpenMode.ForWrite) as Alignment; foreach (BaselineRegion br in b.BaselineRegions) { double st = [code]........