My cascadingdropdown list working fine on my local server but on my webserver its show method error 500 on dropdownlist so when i go fidller for find actual resign for this error i find this error message
System.InvalidOperationException: Request format is invalid: application/json; charset=UTF-8. at System.Web.Services.Protocols.HttpServerProtocol.ReadParameters() at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()