28810edb_ot_Net_Examples__Dot_Net_Helps__Property
[Indexer] A set accessor of an indexer has the same formal parameter list as the indexer, and also to the value parameter. [Property] 
A set accessor of a property contains the implicit value parameter.
Difference between Properties and Indexers : Properties Vs Indexers - Dot Net Tutorials, Dot Net Examples, Dot Net Helps
Property