Make Json String C#

Question

I made a Json file in C# using the following:

var json2 = new {__meta = new Dictionary<string, object> { { "serviceInterfaceVersion", "1.0.0" }}};

var paylod2 = JsonConvert.SerializeObject(json2, Newtonsoft.Json.Formatting.Indented);

This will create json like

{ "__meta": {"serviceInterfaceVersion": "1.0.0"}}

Now i want made following json file how i do

{  "__meta": { "serviceInterfaceVersion": "1.0.0" },

    "folderName": "..\\dm"

}

So, please guide me, thanks.

Nainesh