Cómo convertir la lista genérica de C# a json usando json.net?

Question

Estoy convirtiendo mi tabla de datos a la lista genérica de C#.

DataTable dt = mydata(); 
List<DataRow> list = dt.AsEnumerable().ToList(); 

Ahora, ¿cómo puedo convertir esta list a JSON usando json.net? Cualquier sugerencia.

Ejemplo de formato JSON debe ser así,

{"Table" : [{"userid" : "1","name" : "xavyTechnologies","designation" : "", 
"phone" : "9999999999","email" : "test@test.com","role" : "Admin","empId" : "", 
"reportingto" : ""},{"userid" : "2","name" : "chendurpandian","designation" : 
"softwaredeveloper","phone" : "9566643707","email" : "chendur.pandia@gmail.com", 
"role" : "Super User","empId" : "1","reportingto" : "xavyTechnologies"}, 
{"userid" : "3","name" : "sabarinathan","designation" : "marketer","phone" : 
"66666666666","email" : "bala3569@gmail.com","role" : "User", 
"empId" : "2","reportingto" : "chendurpandian"}]} 

Answer 1

Aquí hay un ejemplo:

using System; 
using System.Data; 
using Newtonsoft.Json.Linq; 

class Test 
{ 
    static void Main() 
    { 
     DataTable table = new DataTable(); 
     table.Columns.Add("userid"); 
     table.Columns.Add("phone"); 
     table.Columns.Add("email"); 

     table.Rows.Add(new[] { "1", "9999999", "test@test.com" }); 
     table.Rows.Add(new[] { "2", "1234567", "foo@test.com" }); 
     table.Rows.Add(new[] { "3", "7654321", "bar@test.com" }); 

     var query = from row in table.AsEnumerable() 
        select new { 
         userid = (string) row["userid"], 
         phone = (string) row["phone"], 
         email = (string) row["email"]    
        }; 

     JObject o = JObject.FromObject(new 
     { 
      Table = query 
     }); 

     Console.WriteLine(o); 
    } 
} 

Documentación: LINQ to JSON with Json.NET

Answer 2

var oSerializer = new System.Web.Script.Serialization.JavaScriptSerializer(); 
string sJSON = oSerializer.Serialize(yourList); 

Referencia: http://blogs.microsoft.co.il/blogs/pini_dayan/archive/2009/03/12/convert-objects-to-json-in-c-using-javascriptserializer.aspx