Why an indexer can be declared only by using 'this' keyword.....?

Question

Without using 'this' keyword, can't we declare an indexer.....?

Answer 1

That is the syntax in C#. As Oussama points out, the 'this' keyword refers to the object itself, the brackets denote the indexer. In other languages this works a bit different.

Answer 2

because it is related to the current instance