Write writes out a binary representation of SqlHierarchyId to the passed-in BinaryWriter. Write cannot be called by using Transact-SQL. Use CAST or CONVERT instead.
void Write(BinaryWriter w)
A BinaryWriter object to which the binary representation of this hierarchyid node will be written out.
CLR return type:void
Write is used internally by SQL Server when it is necessary, such as when loading data from a hierarchyid column. Write is also called internally when a conversion is done between hierarchyid and varbinary.
MemoryStream stream = new MemoryStream();
BinaryWriter bw = new BinaryWriter(stream);
byte encoding = stream.ToArray();