Convert JSON String to Object in C#

public class Department{
    public int DeptId { get; set; }
    public string DepartmentName { get; set; }
        The .NET Core 3.0 and later versions include the built-in class JsonSerializer in the System.Text.Json namespace that provides functionality for serializing and deserializing from JSON. 
    The .NET 4.x framework does not provide any built-in JsonSerializer class that converts objects to JSON.
    You have to install the NuGet package Microsoft.Extensions.Configuration.Json in your project to include the System.Text.Json.JsonSerializer to your project which can be used to convert objects to JSON and vice-versa.
        Deserialization is the process of parsing a string into an object of a specific type. The JsonSerializer.Deserialize() method converts a JSON string into an object of the type specified by a generic type parameter.
Syntax:
            public static TValue? Deserialize<TValue> (string json, 
                        JsonSerializerOptions? options = default);
        The following example shows how to parse a JSON string using the JsonSerializer.Deserialize() method:
        Example: Parsing JSON String

string jsonData = "{\"DeptId\": 101, \"DepartmentName\": \"IT\"}";
Department deptObj = JsonSerializer.Deserialize<Department>(jsonData);
Console.WriteLine("Department Id: {0}", deptObj.DeptId);
Console.WriteLine("Department Name: {0}", deptObj.DepartmentName);
        Try it
            Output:
Department Id is: 101 

Department Name is: IT
    Convert JSON Array String to List
       Many times the JSON string contains an array to store multiple data. This can be converted to an array or list of objects in C#.
        The following example shows how to parse JSON array to C# list collection.
        Example: 

string jsonArray = "[{\"DeptId\": 101,\"DepartmentName\":\"IT\" }, {\"DeptId\": 102,\"DepartmentName\":\"Accounts\" }]";
var deptList = JsonSerializer.Deserialize<IList<Department>>(jsonArray);
foreach(var dept in deptList)
    Console.WriteLine("Department Id is: {0}", dept.DeptId);
    Console.WriteLine("Department Name is: {0}", dept.DepartmentName);
        Try it
    Output:
Department Id is: 101

Department Name is: IT

Department Id is: 102

Department Name is: Accounts
    Convert JSON String to Object in AJAX Application
        Use the JavaScriptSerializer class to provide serialization and deserialization functionality for AJAX-enabled ASP.NET web applications.
        The JavaScriptSerializer.Deserialize() method converts the specified JSON string to the type of the specified generic parameter object.
        The following example shows how to parse JSON string using JavaScriptSerializer.Deserialize() method.
        Example: 

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.Script.Serialization;
namespace MyWebApplication
    public partial class _Default : Page
        protected void Page_Load(object sender, EventArgs e)
            string jsonDept = @"{'DeptId': '101', 'DepartmentName': 'IT'}";
            var serializer = new JavaScriptSerializer();
            Department deptObj = new serializer.Deserialize<Department>(jsonDept);
    public class Department
        public int DeptId { get; set; }
        public string DepartmentName { get; set; }
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