how to return the json data - asp.net

Question

I want to convert string to json
here i want to convert string data object to json
when i inserted the data using web service page see below
and inserted data look like below:
watch window
Code:
public class WebService1 : System.Web.Services.WebService
{
SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["cnn"].ConnectionString);
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string InsertData(string fname, string mname, string lname, string emailid, string password, string contactno, string hobby, string address, string countrycodenum)
{
cn.Open();
string data = fname + mname + lname + emailid + password + contactno + hobby + address + countrycodenum;
string insertquery = "insert into tblstudent(fname, mname, lname, emailid, password, contactno,hobby,address,countrycodenum)values(#fname,#mname,#lname,#emailid,#password,#contactno,#hobby,#address,#countrycodenum)";
SqlCommand cmd = new SqlCommand(insertquery, cn);
//cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#fname", fname);
cmd.Parameters.AddWithValue("#mname", mname);
cmd.Parameters.AddWithValue("#lname", lname);
cmd.Parameters.AddWithValue("#emailid", emailid);
cmd.Parameters.AddWithValue("#password", password);
cmd.Parameters.AddWithValue("#contactno", contactno);
cmd.Parameters.AddWithValue("#hobby", hobby);
cmd.Parameters.AddWithValue("#address", address);
cmd.Parameters.AddWithValue("#countrycodenum", countrycodenum);
int i = cmd.ExecuteNonQuery();
if (i > 0)
{
Console.WriteLine("Insert Successfully");
}
else
{
Console.WriteLine("Not Insert Successfully");
}
cn.Close();
return data;
}
}
}
I install the Newtonsoft package
I want to convert string data object to json??

Answer 1

Instead of this line
string data = fname + mname + lname + emailid + password + contactno + hobby + address + countrycodenum;
Do these two steps.
First create an anonymous object using this line of code:
var dataObject = new { fname, mname, lname, emailid, password, contactno, hobby, address, countrycodenum };
In your example the object would look like this:
{ fname = raju, mname = makvana, lname = dinesh, emailid = raju#gmail.com, password = 12345, contactno = 1234567890, hobby = cricket, address = surat, countrycodenum = uzbekistan }
Second, serialize dataObject to JSON string:
string data = JsonConvert.SerializeObject(dataObject);
Don't forget to use Newtonsoft.Json package.
In your example the JSON string would look like this:
{"fname":"raju","mname":"makvana","lname":"dinesh","emailid":"raju#gmail.com","password":"12345","contactno":"1234567890","hobby":"cricket","address":"surat","countrycodenum":"uzbekistan"}
The entire code is below:
public class WebService1 : System.Web.Services.WebService
{
SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["cnn"].ConnectionString);
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string InsertData(string fname, string mname, string lname, string emailid, string password, string contactno, string hobby, string address, string countrycodenum)
{
cn.Open();
// *** this is old code ***
// string data = fname + mname + lname + emailid + password + contactno + hobby + address + countrycodenum;
// *** this is new code ***
var dataObject = new { fname, mname, lname, emailid, password, contactno, hobby, address, countrycodenum };
string data = JsonConvert.SerializeObject(dataObject);
string insertquery = "insert into tblstudent(fname, mname, lname, emailid, password, contactno,hobby,address,countrycodenum)values(#fname,#mname,#lname,#emailid,#password,#contactno,#hobby,#address,#countrycodenum)";
SqlCommand cmd = new SqlCommand(insertquery, cn);
//cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#fname", fname);
cmd.Parameters.AddWithValue("#mname", mname);
cmd.Parameters.AddWithValue("#lname", lname);
cmd.Parameters.AddWithValue("#emailid", emailid);
cmd.Parameters.AddWithValue("#password", password);
cmd.Parameters.AddWithValue("#contactno", contactno);
cmd.Parameters.AddWithValue("#hobby", hobby);
cmd.Parameters.AddWithValue("#address", address);
cmd.Parameters.AddWithValue("#countrycodenum", countrycodenum);
int i = cmd.ExecuteNonQuery();
if (i > 0)
{
Console.WriteLine("Insert Successfully");
}
else
{
Console.WriteLine("Not Insert Successfully");
}
cn.Close();
return data;
}
}

Answer 2

so you can use from newtonsoft.json library and just define your class and it convert to your class
dynamic obj = Newtonsoft.Json.JsonConvert.DeserializeObject(serviceResult);
foreach (var item in obj1.data)
{
//convert obj1 to your class
}