Can I Set the HTTP Response Code & Throw an Exception on an ASMX JSON Service?
Change your code to this:
[WebMethod][ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]public void TestWebMethod() { try { throw new HttpException((int)HttpStatusCode.BadRequest, "Error Message"); } catch ( HttpException ex ) { Context.Response.StatusCode = ex.GetHttpCode(); // See Markus comment // Context.Response.StatusDescription("Error Message"); // Context.Response.StatusDescription(ex.Message); // exception message // Context.Response.StatusDescription(ex.ToString()); // full exception }}Basically you can't, that is, when throwing an exception the result will always be the same 500.