public Tree CopyReferenclyTree(AddToTree.Tree Exsit) { if (Exsit == null) { return(null); } AddToTree.Tree Current = new AddToTree.Tree(null, false); try { Current.SampleAccess = Exsit.SampleAccess; Current.SetLefTandRightReferencelySide(Exsit.LeftSideAccess, Exsit.RightSideAccess); //ERRORCORECTION091824098.refer to page 177. //ERRORCORECTION9812738 :Refet top age 190. Current.LeftSideAccess.ThreadAccess = Current; Current.RightSideAccess.ThreadAccess = Current; //Current.NodeNumber = Exsit.NodeNumber; } catch (NullReferenceException t) { Formulas.ExceptionClass.ExceptionClassMethod(t); } return(Current); }