JSON & C#
1. System.Text.Json.Utf8JsonReader ref: https://docs.microsoft.com/en-us/dotnet/core/whats-new/dotnet-core-3-0 https://github.com/ysharplanguage/FastJsonParser#Overview 2. Newtonsoft.Json library using NewTonsoft.Json; //Using Manage NuGet Packages installs Newtonsoft.Json . Cat cat2 = new Cat(){name="hik",age=3}; string s1= Newtonsoft.Json.JsonConvert . SerializeObject (cat2); Cat cat3 = JsonConvert . DeserializeObject <Cat>(JSONstr); string outStr2 = JsonConvert.SerializeObject(cat2); private string CapitalFirstLetter(string s) { try { string rs = char.ToUpper(s[0]) + s.Substring(1); return rs; }catch(Exception e) { return s; } } 3. JavaScriptSerializer using System.Web.Script.Serialization ; using System.IO; //Script.Serialization is in System.Web.Extensions . //We need to add a reference that is System.Web.Extensions in Assemblies in Reference Manager