Literal notation for Dictionary in C#?

I currently have a WebSocket between JavaScript and a server programmed in C#. In JavaScript, I can pass data easily using an associative array:

var data = {'test': 'val',
            'test2': 'val2'};

To represent this data object on the server side, I use a Dictionary<string, string>, but this is more ‘typing-expensive’ than in JavaScript:

Dictionary<string, string> data = new Dictionary<string,string>();
data.Add("test", "val");
data.Add("test2", "val2");

Is there some kind of literal notation for associative arrays / Dictionarys in C#?