how to convert dataset with multiple datable to json

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ASP.NET

jQuery

Hi,

I have a dataset with has multiple datatable ,I want to bind each datatable to ampie charts ,
for this i need to convert each datatable to json object and then bind my charts.
for single datatable my code is as follow

[WebMethod]
   public static UserDetails[] BindDatatable(long pvid, long deptid, long locid, long blgid, string article)
   {
       DataTable dt = new DataTable();
       List<UserDetails> details = new List<UserDetails>();
       //string connectionstring = "Data Source=DCS_SERVER;Initial Catalog=DSIM_CLOUD;User ID=sa;Password=sa123;Timeout=200";

       string connectionstring = ConfigurationManager.ConnectionStrings[System.Web.HttpContext.Current.Session["ConnectionStringNuggettsCloud"].ToString()].ConnectionString;
       SqlConnection con = new SqlConnection(connectionstring);
       con.Open();
       SqlCommand comm = new SqlCommand("usp_ReportException", con);
       comm.CommandType = CommandType.StoredProcedure;
       comm.Parameters.Add("@pvid", SqlDbType.BigInt).Value = pvid;

       SqlDataAdapter da = new SqlDataAdapter(comm);
       da.Fill(dt);
       foreach (DataRow dtrow in dt.Rows)
       {
           UserDetails user = new UserDetails();
           user.Article_desc = dtrow["Article_desc"].ToString();
           user.model = dtrow["model"].ToString();

           details.Add(user);
       }

       con.Close();

       // }
       return details.ToArray();

   }
   public class UserDetails
   {
       public string Article_desc { get; set; }
       public string model { get; set; }


   }

<script type="text/javascript">
     $(document).ready(function () {
         //  debugger
         $.ajax({
             type: "POST",
             contentType: "application/json; charset=utf-8",
             url: "ExceptionReport.aspx/BindDatatable",
             data: "{pvid:" + $("#hndPVID")[0].value + ",deptid:" + $("#hndDeptid")[0].value + ",locid:" + $("#hndLocid")[0].value + ",blgid:" + $("#hndBlgid")[0].value + ",article:" + $("#hndArticle")[0].value + "}",
             dataType: "json",
             success: function (data) {
                 // debugger
                


             },
             error: function (result) {
                 alert("Error");
             }
         });


      

     });
    </script>

This is way i am binding charts with single datatable ,with if there is dataset with multiple datatable then how is it possible please help.

SqlDataAdapter da = new SqlDataAdapter(comm);
      da.Fill(ds);

then how will i convert dataset with multiple datatable to json ??