Quite generalized according to your given code but i hope this will help you out!
<pre lang="c#">string[] newArray = new string[2];
string SerializedData = Newtonsoft.Json.JsonConvert.SerializeObject(newArray);
HiddenCOntrol.value = SerializedData;
string[] DesirializedData = (string[])Newtonsoft.Json.JsonConvert.DeserializeObject(HiddenControl.Value);