Read JSON response and fetch value using C# in ASP.Net

{
    "status": "success",
    "data": [
        [
            {
                "pdfString": "JVBERi0xLjcKJeLjz9M"
            }
        ]
    ],
    "msg": "Data Successfully Retrived"
}

public class Example
{
    public string status { get; set; }
    //public IList<IList<Datum>> dataw { get; set; }
    public List<Emp_info> data { get; set; }
    public string msg { get; set; }
}
 
public class Example1
{
    public string status { get; set; }
    public List<List<Datum2>> data { get; set; }
   
    public string msg { get; set; }
    
}
 
public class Datum
{
    public string value { get; set; }
    public string key { get; set; }
    
}
 
public class Datum2
{
    public string value { get; set; }
    public string key { get; set; }
    public string pdfString { get; set; }
    
}

My json respone and class to retreview the data

What I did wrong in my code?

                    var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                    using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                    {
                        var responseText = streamReader.ReadToEnd();                  
                        Example1 dat = (Example1)JsonConvert.DeserializeObject(responseText, typeof(Example1));
                        if (dat.status == "success")
                        {
                            string pdfString = dat.data[0][0].value;
                            Response.AddHeader("Content-Type", "application/pdf");
                            Response.AddHeader("Content-Length", pdfString.Length.ToString());
                            Response.AddHeader("Content-Disposition", "inline;");
                            Response.AddHeader("Cache-Control", "private, max-age=0, must-revalidate");
                            Response.AddHeader("Pragma", "public");
                            Response.BinaryWrite(Convert.FromBase64String(pdfString));
                        }
                    }

I am  getting  if (dat.status == "success") 

true 

but after I am not getting idea to convert the json to object.