Hi abhi619,
To Serialize and Deserialize JSON object you need to add the namespace
System.Web.Script.Serialization in the page which is inside System.Web.Extensions assembly.
Then you can use Serialize and Deserialize method like below.
JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.Serialize(object);
javaScriptSerializer.Deserialize("JsonString", "targetType");