What is it and where to I get one?
Seriously. If you Google “ExpressionParseHelper” you will get tons of snippets using it but 0 references to where it comes from.
I even searched MSDN with bing and the only results are StackOverflow answers.
I’m using .net 4.
example: Format Date On Binding (ASP.NET MVC)
Its a custom static method on the class named
ExpressionParseHelper. Its not part of the framework. The code is on the answer you have linked to.