Serialize and desirialize multiple JSON to C#

I have three txt files which contain the same Json data i want to read them all in c# class objects and overwrite all the objects from a textbox value in all the files at the same time

in short i have these fields common in all three text files

 

 

i want store their values in the c# object class from all three files at a time and then overwrite the same object values supplied by a textbox value for all the attributes read by three different files

code to read single file data

 

using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))

{

_orderRequest = (OrderRequest)JsonReader.ReadRecord(fs, _recordManager, TicketingRecordNames.OrderRequest);

}

my object class

public class OrderRequest

{

public string org;

public string raff;

public string time;

public string user;

public OrderRequest _orderRequest;

}

FILE 1 data

{

"org":"OrgTest",

"raff":"Raffle1",

"time":"112828",

"user":"User1",

}

FILE 2 data

{

"org":"OrgTest",

"raff":"Raffle1",

"time":"112828",

"user":"User111",

}