Asp.net Web Method Returns JSON - json

Question

I need to create a WebMethod that returns my member database values on JSON. I try something like that but it actually failed.
[WebMethod(EnableSession = false)]
public static UYELER handleAjaxRequest(string mailX, string passwordX)
{
DataSet dsX = ReadSql("select top 3 * from fuyeler ");
for (int i = 0; i < dsX.Tables[0].Rows.Count; i++)
{
mailX = dsX.Tables[0].Rows[i]["stMail"].ToString();
passwordX = dsX.Tables[0].Rows[i]["stPass"].ToString();
}
return new UYELER
{
mail = mailX,
password = passwordX,
};
}
public class UYELER
{
public int ID { get; set; }
public string mail { get; set; }
public string password { get; set; }
}
Readsql is my quick sql connection class.

Answer 1

You can return Json from an Asp.Net method by clearing the normal output in Page_Load and returning your own output. See this StackOverflow answer...
To convert a C# object to JSON you can use a library such as Json.NET.

Answer 2

Method 1:
Add this to your Application_Start in Global.asax page:
protected void Application_Start()
{
var json = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
json.UseDataContractJsonSerializer = true;
//....
}
Method 2
You can alse decorate your method with ResponseFormat set JSON
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
[WebMethod(EnableSession = false)]
public static UYELER handleAjaxRequest(string mailX, string passwordX)
{
DataSet dsX = ReadSql("select top 3 * from fuyeler ");
for (int i = 0; i < dsX.Tables[0].Rows.Count; i++)
{
mailX = dsX.Tables[0].Rows[i]["stMail"].ToString();
passwordX = dsX.Tables[0].Rows[i]["stPass"].ToString();
}
return new UYELER
{
mail = mailX,
password = passwordX,
};
}