how to get data present in a json file in asp.net c#

public DataTable GetDtFromJson(string jsonString)
    {
        try
        {

            var table = JsonConvert.DeserializeObject<DataTable>(jsonString);
            return table;
        }
        catch (Exception ex)
        {
            throw new ArgumentException(ex.Message);
        }
    }

using Newtonsoft.Json;
using Newtonsoft;

DataSet dsRecognize = new DataSet();
string jsonStringRecognize = "Json String";
XmlDocument xdRecognize = new XmlDocument();
jsonStringRecognize = "{ \"rootNode\": {" + jsonStringRecognize.Trim().TrimStart('{').TrimEnd('}') + "} }";
xdRecognize = (XmlDocument)JsonConvert.DeserializeXmlNode(jsonStringRecognize);

dsRecognize.ReadXml(new XmlNodeReader(xdRecognize));