What is Php json_encode alternative for asp.net?

System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
string jsonresult = serializer.Serialize(/*object to serialize*/);

string[] myarr = { "Chris", "Hi", "Asp.Net"};
JavaScriptSerializer serializer=new JavaScriptSerializer();
string arrayJson = serializer.Serialize(myarr);