Non-invocable member 'tostring' cannot be used like a method

here is my complete code

in code.aspx.cs

[WebMethod]
public static bool register(string rusrid, string rname, string raddress, string rcity,string rdistrict,string rstate,int rpin,string rlanph,string rmob,string rgen, string remail,string rpass)
{

bool msg = false;
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
con.Open();
SqlCommand cmd = new SqlCommand("user_reg", con);
cmd.CommandType = CommandType.StoredProcedure;


cmd.Parameters.AddWithValue("@custid", rusrid);
cmd.Parameters.AddWithValue("@name", rname);
cmd.Parameters.AddWithValue("@address", raddress);
cmd.Parameters.AddWithValue("@city", rcity);

cmd.Parameters.AddWithValue("@district", rdistrict);
cmd.Parameters.AddWithValue("@state", rstate);
cmd.Parameters.AddWithValue("@pin", rpin);
cmd.Parameters.AddWithValue("@mobile", rmob);

cmd.Parameters.AddWithValue("@landphone", rlanph);
cmd.Parameters.AddWithValue("@email", remail);
cmd.Parameters.AddWithValue("@gender", rgen);
cmd.Parameters.AddWithValue("@password", rpass);
//cmd.Parameters.AddWithValue("@Jdate", System.DateTime.Now);
//cmd.Parameters.Add("@Jdate", SqlDbType.Date).Value = String.Format("{0:dd/MM/yyyy}", DateTime.Now);
cmd.Parameters.Add("@Jdate", SqlDbType.Date).Value = DateTime.Now.ToString("dd/MM/yyyy");
cmd.Parameters.AddWithValue("@cstatus", '1');
//else if (status == "UPDATE")

cmd.ExecuteNonQuery();
msg = true;
}
return msg;
}


script




function SaveRecord() {
//Get control's values
//$.support.cors = true;
var userid = document.getElementById("txt_usrid").value;
var name = document.getElementById("txt_name").value;
var address = document.getElementById('txt_address').value;
var city = document.getElementById('txt_city').value;
var district = document.getElementById('txt_district').value;
var state = document.getElementById('txt_state').value;
var pin = document.getElementById('txt_pin').value;
var landph = document.getElementById('txt_lp').value;
var Mob = document.getElementById('txt_mp').value;
var gen = document.getElementById('txt_gender').value;
var email = document.getElementById('txt_email').value;
var pass = document.getElementById('txt_pass').value;

//if (name == '') {
// alert("please enter name");
// return false
//}
//if (email == '') {
// alert("Please enter email id");
//}

//if (subject == '') {
// alert("Please enter subject");
// return false
//}
//if (message == '') {
// alert("Please enter message");
// return false
//}



var msg = "";
//check for validation
//if (txt11 == '') {
// msg += "<li>Please enter name</li>";
//}
//if (txt22 == '') {
// msg += "<li>Please enter author name</li>";
//}


if (msg.length == 0) {
//Jquery ajax call to server side method
$.ajax({
type: "POST",
dataType: "json",
contentType: "application/json; charset=utf-8",
//Url is the path of our web method (Page name/function name)