CSHARP

c# json get value by key

string jsonData = @"{
'FirstName':'Pietie',
'LastName':'Massimo'
}";

var details = JObject.Parse(jsonData);
var firstName = details["FirstName"]

or 

dynamic details = JObject.Parse(jsonData);
var firstName = details.FirstName;

how to get key value from json object in c#

//You want to convert it to an object first and then 
//access normally making sure to cast it.

JObject obj = JObject.Parse(json);
string name = (string) obj["Name"];