Unknown web method. Parameter name: methodName
ajax, asp.net, c#, pagemethods
Solution
I had a problem in the actual .aspx file, the line
<%@ Page Language="C#"
AutoEventWireup="true"
CodeBehind="xxx.xxx.cs" Inherits="xxx.xxx" %>
wasn't present in the code. How did it get changed? I Don't know :(.
Problem
In researching this problem most SO issues were about the `static` method as a fix. Since it's not working with the real (and a bit sophisticated) WebMethod I've just created a simple one for the sake of checking if reaching the method itself is possible. ``` [WebMethod] [ScriptMethod(UseHttpGet = false)] public static string HelloWorld() { return "Hello World!"; } ``` The call. ``` <script> $(document).ready(function () { $.ajax({ type: "POST", contentType: "application/json; charset=utf-8", url: "usersWebMethods.aspx/HelloWorld", dataType: "json", success: function (data) { alert(data.d); } }); }); </script> ``` It always comes down to `500 (Internal Server Error)` ``` Unknown web method HelloWorld. Parameter name: methodName Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ArgumentException: Unknown web method HelloWorld. Parameter name: methodName ``` Why is this failing?